研究者基本情報

• 博士（理学）, 九州大学
• 修士（比較社会文化）, 九州大学

• https://researchmap.jp/read0074129

• https://jglobal.jst.go.jp/detail?JGLOBAL_ID=200901009650396974
• http://lab.agr.hokudai.ac.jp/systent/kazu/

• 10322843

• 200901009650396974

• 昆虫学 ・系統学・分類学
• Evolution
• Morphology
• Taxonomy
• Phylogenetics
• Entomology

• ライフサイエンス, 多様性生物学、分類学

• 学士課程, 農学部
• 修士課程, 農学院
• 博士課程, 農学院

研究活動情報

• 2025年09月, 日本昆虫学会, 論文賞
  Traumatic copulation and counterpart female traits are widespread in fritillary butterflies (Lepidoptera: Nymphalidae: Argynnini).
  Matoba, T., Kamimura, Y. & Yoshizawa, K.
• 2017年09月, イグノーベル賞（生物学）
  Discovery of a female penis and male vagina in a cave insect
  吉澤 和徳, 受賞者：Yoshizawa, K., Ferreira, R.L., Kamimura, Y., Lienhard, C., 国内外の国際的学術賞
• 2017年02月, 北海道大学, 研究総長賞(奨励賞)
  吉澤 和徳
• 2016年02月, 北海道大学, 総長賞(奨励賞)
  吉澤 和徳
• 2013年09月, 日本昆虫学会, 学会賞
  吉澤和徳;我妻睦美

• Host-shifting pattern common in relatives: phylogenetic study of Sapindaceae-associated Cameraria (Lepidoptera: Gracillariidae), with a description and population genetics of Cameraria serena sp. nov.
  Masayasu Sawada; Kazunori Yoshizawa; Charles S Eiseman; Neung-Ho Ahn; Wanggyu Kim; Issei Ohshima
  Biological Journal of the Linnean Society, 146, 4, Oxford University Press (OUP), 2025年12月01日
  研究論文（学術雑誌）, Abstract
  
  Host shifting is a key driver of diversification in phytophagous insects, and multiple host shifts between the same host pairs within a single insect taxon may be one factor in their greater species richness compared to plants. The leaf-mining moth genus Cameraria (Lepidoptera: Gracillariidae) contains several Acer-feeding and Aesculus-feeding species, and their morphology implies multiple host shifts between Acer and Aesculus. We inferred phylogenetic relationships among these Cameraria species based on multilocus data, indicating that such host shifts occurred once in the Nearctic and twice in the Palearctic. We describeCameraria serena sp. nov., a Japanese Aesculus turbinata-feeder, which is sister to C. acericola, an East Asian Acer-feeder, rather than to European or North American Aesculus-feeders. Population genetic analyses revealed two genetic groups within C. serena, exhibiting different historical population dynamics but with almost completely overlapping current geographical distributions. Despite its strict host association, C. serena shows a phylogeographical structure incongruent with that of its host (Aesculus turbinata). This discrepancy, in light of the multiple shifting events inferred from the phylogenetic analysis, probably reflects delayed colonization of Aesculus turbinata by C. serena as well as differences between their dispersal abilities.
• Wing base morphology supports paraphyly of Papilionoidea s.s. (Lepidoptera)
  Kohei Sakai; Masaya Yago; Kazunori Yoshizawa
  Entomological Science, 28, 3, Wiley, 2025年08月06日
  研究論文（学術雑誌）, Abstract
  
  Traditionally, skippers (Hesperiidae) and moth‐like butterflies (Hedylidae) were classified in separate superfamilies outside the butterfly superfamily Papilionoidea sensu stricto. However, recent molecular phylogenies including phylogenomics placed the swallowtails (family Papilionidae) as the sister group to all other butterflies, including skippers and moth‐like butterflies, making the traditionally recognized Papilionoidea s.s. paraphyletic. However, no morphological studies have supported this relationship to date. Here, we conducted a cladistic analysis based on wing base characters to evaluate these competing systematic hypotheses. Our results support a sister‐group relationship between skippers and moth‐like butterflies and their inclusion within Papilionoidea sensu lato, consistent with molecular‐based phylogenies. In contrast, the wing base morphology suggests the monophyly of Pieridae + Riodinidae + Lycaenidae, a result that contradicts both molecular and other morphological evidence, highlighting the potential limitations of this character system. Based on our morphological examinations and ancestral state reconstruction, we propose a hypothetical ground plan for the butterfly wing base.
• Parental guarding behaviour affects the evolution of egg shapes
  Shin-ichi Kudo; Tomohiro Harano; Jing-Fu Tsai; Kazunori Yoshizawa; Nobuyuki Kutsukake
  Biological Journal of the Linnean Society, 145, 1, Oxford University Press (OUP), 2025年05月02日
  研究論文（学術雑誌）, Abstract
  
  The understanding of the adaptive evolution of egg shapes has developed rapidly. In some insects, females adopt a straddling posture on substrates to guard clutches against predators. Eggs located in the peripheral area of such clutches experience high predation pressure. Thus, selection might favour compact clutches composed of longitudinally elongated eggs. Shield bugs (Heteroptera: Acanthosomatidae), in which maternal guarding of eggs has undergone repeated evolution, provide a good opportunity to test this hypothesis. Our phylogenetic comparative analyses revealed that eggs were more elongated in caring species than in non-caring ones, although this difference was obscured in species with large eggs. Reconstructed ancestral states of egg shape and maternal care suggested that the enhanced elongation of eggs occurred after the establishment of maternal care. These findings indicate that post-ovipositional parental care affects the evolution of egg shapes, depending on egg geometry.
• The first detailed morphological treatment of a Cretaceous psocid and the character evolution of Trogiomorpha (Insecta: Psocodea)
  Michael Weingardt; Feiyang Liang; Brendon E. Boudinot; Jörg U. Hammel; Bernhard L. Bock; Kazunori Yoshizawa; Rolf G. Beutel
  Arthropod Structure & Development, 85, 101409, 101409, Elsevier BV, 2025年03月
  研究論文（学術雑誌）
• Taxonomic review of Epeorus s. l. Eaton, 1881 (Ephemeroptera: Heptageniidae) in Sapporo City and adjacent areas, Hokkaido, Japan
  TATSUSHI TAKAYANAGI; KAZUNORI YOSHIZAWA
  Zootaxa, 5594, 1, 1, 49, Magnolia Press, 2025年02月27日
  研究論文（学術雑誌）, Three species within the genus Epeorus s. l. Eaton, viz., Epeorus latifolium Uéno, 1928, E. L-nigrum Matsumura, 1931, and E. uenoi (Matsumura, 1933), whose types were collected from Sapporo City, Japan, and neighboring areas, have been confused for a long time. In this study, intensive field sampling and investigation of museum specimens revealed E. latifolium and E. L-nigrum are indeed distinct species, while E. uenoi is a synonym of E. latifolium. Thus, this study partially resolves the taxonomic confusion surrounding Japanese E. latifolium-like species. However, numerous closely related species in Northeast Asia remain challenging to delineate. A critical factor in this taxonomic ambiguity is the definition of subgenus Belovius Tshernova, 1981, as the description of its type species, E. latifolium, was based on a misidentified specimen. Additionally, this study presents morphological features and DNA sequence data for three other related species from the same areas, viz., E. curvatulus Matsumura, 1931; E. aesculus Imanishi, 1934; and E. nipponicus (Uéno, 1931). The subgeneric classification of each species is evaluated following Kluge’s (2004) system, with E. L-nigrum newly assigned to the subgenus Belovius and E. curvatulus to the subgenus Caucasiron Kluge, 1997.
• Discovery of a novel ejaculation mechanism in danceflies (Diptera: Empididae), with implications for genital elongation
  Tomoki Hirose; Kazunori Yoshizawa
  The Science of Nature, 111, 5, Springer Science and Business Media LLC, 2024年09月23日, ［査読有り］, ［責任著者］
  研究論文（学術雑誌）
• Morphology of the pterothoracic musculature in Paraneoptera and its phylogenetic implication (Insecta: Neoptera)
  Azuma Kawata; Naoki Ogawa; Kazunori Yoshizawa
  Journal of Morphology, 285, 6, Wiley, 2024年05月27日, ［査読有り］
  研究論文（学術雑誌）, Abstract
  
  Although the monophyly of Paraneoptera (=hemipteroid orders or Acercaria, composed of Psocodea, Thysanoptera and Hemiptera) has been widely accepted morphologically, the results from molecular phylogenetic and phylogenomic analyses contradict this hypothesis. In particular, phylogenomic analyses provide strong bootstrap support for the sister group relationship between Psocodea and Holometabola, that is, paraphyly of Paraneoptera. Here, we examined the pterothoracic musculature of Paraneoptera, as well as a wide range of other neopterous insect orders, and analysed its phylogenetic implication. By using the synchrotron microcomputed tomography (µCT) and parsimony‐based ancestral state reconstruction, several apomorphic conditions suggesting the monophyly of Paraneoptera, such as the absence of the II/IIItpm7, IIscm3, IIIspm2 and IIIscm3 muscles, were identified. In contrast, no characters supporting Psocodea + Holometabola were recovered from the thoracic muscles. These results provide additional support for the monophyly of Paraneoptera, together with the previously detected morphological apomorphies of the head, wing base, and abdomen.
• Traumatic copulation and counterpart female traits are widespread in fritillary butterflies (Lepidoptera: Nymphalidae: Argynnini)
  Tatsuki MATOBA; Yoshitaka KAMIMURA; Kazunori YOSHIZAWA
  Entomological Science, 27, 2, Wiley, 2024年04月03日
  研究論文（学術雑誌）, Abstract
  
  Female fritillary butterflies (Lepidoptera: Nymphalidae: Argynnini) are known to have diversified genital structures, especially at the entrance of the bursa copulatrix. However, the origin and function of such elaborated structures are poorly known to date. We examined the male and female genital structures of six Japanese species selected from five genera/subgenera [Argynnis (Argynnis), Argynnis (Damora), Argynnis (Argyronome), Fabriciana, and Speyeria] of the Argynnini tribe and found that traumatic copulation is widespread in Argynnini. Various male genital structures, such as the uncus, valva, and phallus, can cause wounds to the female genitalia. The eighth venter of the female, where the highest morphological diversity in female genitalia was detected, is hooked and held by the male uncus during copulation. It is very likely that the diversified female genital structure coevolved with the male uncus as a counterpart for traumatic coupling.
• Maternal care under large clutches with small eggs: The evolution of life history traits in shield bugs
  Shin-ichi Kudo; Tomohiro Harano; Jing-Fu Tsai; Kazunori Yoshizawa; Nobuyuki Kutsukake
  The American Naturalist, University of Chicago Press, 2024年02月27日
  研究論文（学術雑誌）
• Two new species of Cameraria Chapman (Lepidoptera: Gracillariidae) associated with Salix or Cornus in Japan
  MASAYASU SAWADA; KAZUNORI YOSHIZAWA; ISSEI OHSHIMA
  Zootaxa, 5410, 2, 177, 198, Magnolia Press, 2024年02月13日
  研究論文（学術雑誌）, Two new species of the genus Cameraria Chapman, 1902, Cameraria riparia sp. nov. and Cameraria corni sp. nov., are described from Japan. Larval setal maps, illustrations and/or photographs of wing patterns, wing venations and genitalia are provided for both species, and the systematic positions of the two species are discussed based on their morphologies. The larvae of C. riparia feed on Salix spp. and make blotch mines, whereas C. corni larvae feed on Cornus kousa subsp. kousa and make linear blotch mines. C. riparia was collected on Hokkaido and Honshu Islands, and considerable differences in the male genital characters were detected between the two populations. However, a molecular phylogenetic analysis based on the COI barcode region indicated that there was no clear genetic differentiation between the two populations (maximum divergence, 1.41%). C. corni was collected on Honshu and Kyushu Islands, and this is the first record of the trophic association of Lithocolletinae with Cornaceae.
• Is the copulation of silver-washed fritillary inverted? Function of the female genital projection (Lepidoptera: Nymphalidae: Argynnini)
  Tatsuki Matoba; Yoshitaka Kamimura; Kazunori Yoshizawa
  Organisms Diversity & Evolution, 23, 4, 871, 879, Springer Science and Business Media LLC, 2023年10月18日
  研究論文（学術雑誌）
• Are males just passive? Coupling mechanism of the Brazilian cave insects with inverted genitalia
  Zixin Cheng; Yoshitaka Kamimura; Rodrigo L. Ferreira; Charles Lienhard; Kazunori Yoshizawa
  The Science of Nature, 110, 3, Springer Science and Business Media LLC, 2023年06月01日
  研究論文（学術雑誌）
• Acquisition of novel muscles enabled protruding and retracting mechanisms of female penis in sex-role reversed cave insects
  Zixin Cheng; Yoshitaka Kamimura; Rodrigo L. Ferreira; Charles Lienhard; Kazunori Yoshizawa
  Royal Society Open Science, 10, 1, The Royal Society, 2023年01月11日
  研究論文（学術雑誌）, Brazilian sex-role reversed cave insects (genus Neotrogla ) have a striking structure called the gynosome (or female penis), which deeply penetrates male vagina-like genitalia during copulation to receive nutritious semen. However, the protruding and retracting mechanisms of the female penis, including their evolutionary origin, are poorly understood. By using micro-computed tomography (µCT), we compared the genital morphology and musculature between species with a gynosome and others lacking this structure. As a result, we discovered two groups of muscles related to the protrusion and retraction of gynosomes. These muscles were also observed in species with non-protrusible prepenis. This suggests that evolution of these muscles preceded the acquisition of the protruding function of the gynosome, originally having a putative stimulatory function to receive nutritious semen. This intermediate stage probably allowed for the reversal of genital functions.
• An additional new species of Trichadenotecnum from Japan (Psocodea: Psocidae).
  Yoshizawa, K
  Insecta matsumurana, new series, 78, 21, 25, 2022年10月, ［査読有り］
• Oriental Psyllipsocus (Psocodea: 'Psocoptera': Psyllipsocidae): checklist, new records and description of four new species from Southeast Asia .
  Lienhard, C; Yoshizawa, K; Idris, A
  Insecta matsumurana, new series, 78, 1, 19, 2022年10月, ［査読有り］, ［責任著者］
• Morphology and phylogenetic significance of the thoracic muscles in Psocodea (Insecta: Paraneoptera)
  Azuma Kawata; Naoki Ogawa; Kazunori Yoshizawa
  Journal of Morphology, 283, 8, 1106, 1119, Wiley, 2022年07月18日
  研究論文（学術雑誌）, Abstract
  
  The thoracic musculature of the insect order Psocodea has been examined in only a few species of a single suborder to date. In the present study, we examined the thoracic musculature of species selected from all three suborders of Psocodea to elucidate the ground plan of the order and to examine the phylogenetic utility of the character system. The sister‐group relationship between the suborders Troctomorpha and Psocomorpha received support from two novel nonhomoplasious synapomorphies, although the support from other morphological characters for this relationship is ambiguous. The sister‐group relationship between the infraorders Epipsocetae and Psocetae also received support from one nonhomoplasious synapomorphy, although no other morphological characters supporting this relationship have been identified to date. The present examination revealed the potential of thoracic muscle characters for estimating deep phylogeny, possibly including interordinal relationships.
• New Genus and Species of Empheriidae (Insecta: Psocodea: Trogiomorpha) and Their Implication for the Phylogeny of Infraorder Atropetae
  Sheng Li; Kazunori Yoshizawa; Qiuzhu Wang; Dong Ren; Ming Bai; Yunzhi Yao
  Frontiers in Ecology and Evolution, 10, Frontiers Media SA, 2022年06月09日
  研究論文（学術雑誌）, Two species of psocids discovered from the Mid-Cretaceous Burmese amber, Latempheria kachinensis Li, Yoshizawa, and Yao, gen. et sp. nov. and Burmempheria curvatavena Li, Yoshizawa, and Yao, sp. nov., are described and assigned to the Empheriidae (Trogiomorpha: Atropetae) family. A phylogenetic analysis of the infraorder Atropetae is conducted based on 38 morphological characters of three outgroups and fifteen ingroups, which supported the monophyly of Atropetae including fossil and extant taxa. In the phylogenetic result, all the genera of fossil families Empheriidae and Archaeatropidae form a monophyletic group, sister to the extant members of Atropetae. The two fossil families also share a lot of similarities in morphology, locality, and geological period. Recently discovered fossil species exhibited combined morphological characters of both families. Based on these observations and the results of the phylogenetic analysis, Archaeatropidae is treated here as a new junior synonym of Empheriidae.
• Exploration of the homology among the muscles associated with the female genitalia of the three suborders of Psocodea (Insecta)
  Zixin Cheng; Kazunori Yoshizawa
  Arthropod Structure & Development, 66, 101141, 101141, Elsevier BV, 2022年01月
  研究論文（学術雑誌）
• Evolution of nuptial gifts and its coevolutionary dynamics with male-like persistence traits of females for multiple mating
  Yoshitaka Kamimura; Kazunori Yoshizawa; Charles Lienhard; Rodrigo L. Ferreira; Jun Abe
  BMC Ecology and Evolution, 21, 1, Springer Science and Business Media LLC, 2021年12月, ［査読有り］
  研究論文（学術雑誌）,
  
  Many male animals donate nutritive materials during courtship or mating to their female mates. Donation of large-sized gifts, though costly to prepare, can result in increased sperm transfer during mating and delayed remating of the females, resulting in higher paternity. Nuptial gifting sometimes causes severe female-female competition for obtaining gifts (i.e., sex-role reversal in mate competition) and selection on females to increase their mating rate, changing the intensity of sperm competition and the resultant paternity gains. We built a theoretical model to simulate such coevolutionary feedbacks between nuptial gift size (male trait) and propensity for multiple mating (female trait). Donation of nuptial gifts sometimes causes development of female persistence trait for gift acquisition. We also analyzed the causes and consequences of this type of traits, taking double receptacles for nutritious seminal gifts, which are known to occur in an insect group with a “female penis” (Neotrogla spp.), as an illustrative example.
  
  
  
  
  Our individual-based simulations demonstrated that female-female competition for male-derived nutrients always occur when the environment is oligotrophic and mating costs are low for females. However, a positive correlation between donated gift size and the resultant paternity gain was a requisite for the co-occurrence of large gifts and females’ competitive multiple mating for the gifts. When gift donation satisfied female demands and thus resulted in monandry, exaggeration of nuptial gift size also occurred under the assumption that the last male monopolizes paternity. The evolution of double slots for gift acquisition and digestion (female persistence trait) always occurred when males could not satisfy the demands of females for gifts. However, through coevolutionary reduction in male gift size, fixation of this trait in a population drastically reduced the average female fitness.
  
  
  
  
  Sperm usage patterns, which have rarely been examined for animals with nuptial gifts, can be a critical factor for determining the extent of exaggeration in nuptial gifting. Sex-role reversals in mate competition, as a result of donation of nuptial gifts from males to females, can involve the evolution of male-like, persistent traits in females that reduce population productivity, as is the case with persistence traits in males.
  
  
  
• Functional morphology and phylogenetic significance of the forewing base structure in Ensifera (Orthoptera)
  Mamoru Takahashi; Kazunori Yoshizawa
  Insect Systematics & Evolution, 53, 2, 185, 199, Brill, 2021年11月02日
  研究論文（学術雑誌）, Abstract
  
  The forewing base structure of the orthopteran suborder Ensifera, a group of insects well known for their sound-producing behavior, was examined by using light microscopy, confocal laser scanning microscopy, and µCT. We detected significant novel characters, such as functional changes in the tpm9 muscle from the flexor to the extensor of the forewing that are likely associated with the acquisition of sound-producing behavior using forewings. Phylogenetic analysis based on the characters selected from the forewing base structure showed that the character system contains a strong phylogenetic signal supporting the monophyly of Ensifera, Tettigonioidea and Grylloidea as well as the sister-group relationship between Grylloidea and Gryllotalpoidea, but no apomorphies to resolve the deep phylogeny among superfamilies could be determined from this character system.
• The earliest fossil record of the suborder Psocomorpha (Insecta: Psocodea) from mid-Cretaceous Burmese amber, with description of a new genus and species.
  Yoshizawa, K; Yamamoto, S
  Insecta matsumurana, new series, 77, 1, 15, 2021年10月, ［査読有り］, ［筆頭著者］
• New psocids (Psocodea: Prionoglarididae, Psyllipsocidae) from Cretaceous Burmese amber deposits
  Corentin Jouault; Kazunori Yoshizawa; Marina Hakim; Diying Huang; André Nel
  Cretaceous Research, 126, 104890, 104890, Elsevier BV, 2021年10月, ［査読有り］
  研究論文（学術雑誌）
• Phylogeography of the stonefly Kamimuria tibialis: multiple glacial refugia and sympatric occurrence of different lineages in the southern islands of Japan
  Akiko Otsuki; Kazunori Yoshizawa; Shin-Ichi Akimoto
  Biological Journal of the Linnean Society, 134, 2, 316, 330, Oxford University Press (OUP), 2021年09月10日, ［査読有り］
  研究論文（学術雑誌）,
  To elucidate the effect of Pleistocene climatic fluctuations on the historical distribution and geographical genetic structure of temperate Japanese species, we performed phylogeographical and demographic analyses using mitochondrial gene sequences obtained from the stonefly species Kamimuria tibialis, sampled from four main islands of the Japanese Archipelago (i.e. Hokkaido, Honshu, Shikoku and Kyushu) and Tsushima Island. We detected three main clades with distinct geographical distributions, including the Tsushima, Kyushu and Hokkaido–Honshu–Shikoku phylogroups. These groups were estimated to have diverged from one another 0.54–2.02 Mya, suggesting they have undergone several glacial cycles in different refugia. Our results showed that during the glacial epochs and with a fall in sea-level, gene flow was limited among Tsushima and Kyushu, and among Hokkaido and Honshu, probably because the straits between these islands are deep. The population in Kyushu and Shikoku, the southernmost islands, exhibited high genetic diversity, with two distinct haplotype lineages occurring sympatrically. These results suggest that the population division into multiple refugia and the existence of stable southern refugia have contributed to the high genetic diversity of the species in this region.
• The first record of Caenis rivulorum (Ephemeroptera: Caenidae) from Japan
  Tatsushi Takayanagi; Kazunori Yoshizawa
  Biodiversity Data Journal, 9, Pensoft Publishers, 2021年07月08日, ［査読有り］
  研究論文（学術雑誌）, Caenis rivulorum Eaton, 1884 is widely distributed and has been reported from a wide range in the Palearctic Region.
  
  
  We report this species from Japan for the first time, from five localities of Hokkaido, based on morphology and molecular data.
• Mitochondrial genomes within bark lice (Insecta: Psocodea: Psocomorpha) reveal novel gene rearrangements containing phylogenetic signal
  Oscar Fernando Saenz Manchola; Stephany Virrueta Herrera; Lorenzo Mario D'Alessio; Kazunori Yoshizawa; Alfonso Neri García Aldrete; Kevin P. Johnson
  Systematic Entomology, 46, 4, 938, 951, Wiley, 2021年07月, ［査読有り］
  研究論文（学術雑誌）, ABSTRACT
  
  Psocodea (booklice and parasitic lice) is an order of insects containing species with extensive mitochondrial genome rearrangements, particularly within the suborder Troctomorpha, in which some species possess an extremely fragmented mitochondrial genome with several small minichromosomes. In the remaining suborders of Psocodea, there are groups with the ancestral pancrustacean arrangement, quite extensive rearrangements (e.g. Trogiomorpha), or in which the small number of species analysed to date have rearrangements of only a few protein‐coding genes and/or tRNAs (e.g. Psocomorpha). Despite the apparent high rate of rearrangements in the order as a whole, a small number of complete mitochondrial genomes are available, especially for suborder Psocomorpha, the largest free‐living suborder. To understand the evolution of the gene arrangement of the mitochondrial genome within Psocomorpha and its phylogenetic implications, we assembled and analysed the mitochondrial genomes of 33 species of bark lice belonging to nine families in two infraorders. Within the infraorder Homilopsocidea, four families were analysed, mainly from Lachesillidae (which included 22 species of this family). Within the infraorder Caeciliusetae, seven species representing five families were analysed. Mitochondrial gene rearrangements were identified in seven of the nine families. Some of these rearrangements were unique to a single species, while some contained phylogenetic signal, being shared by related species. These rearrangements typically corresponded to transpositions and inversions of tRNAs, possibly caused by tandem duplication–random loss (TDRL) and/or recombination events. Phylogenetic analyses of mitochondrial gene sequences provided phylogenetic resolution for several branches of the tree, including monophyly of Lachesillinae. The genus Hemicaecilius Enderlein was found to be embedded within the genus Lachesilla Westwood, rending the latter paraphyletic. Monophyly was also never recovered for Lachesillidae and Elipsocidae as currently defined. However, instability was observed for some higher level relationships within Psocomorpha, including the relationships among the major clades of Lachesillidae.
• Phylogenomics of Parasitic and Nonparasitic Lice (Insecta: Psocodea): Combining Sequence Data and Exploring Compositional Bias Solutions in Next Generation Data Sets
  Robert S de Moya; Kazunori Yoshizawa; Kimberly K O Walden; Andrew D Sweet; Christopher H Dietrich; Johnson Kevin P
  Systematic Biology, 70, 4, 719, 738, Oxford University Press (OUP), 2021年06月16日, ［査読有り］
  研究論文（学術雑誌）,
  The insect order Psocodea is a diverse lineage comprising both parasitic (Phthiraptera) and nonparasitic members (Psocoptera). The extreme age and ecological diversity of the group may be associated with major genomic changes, such as base compositional biases expected to affect phylogenetic inference. Divergent morphology between parasitic and nonparasitic members has also obscured the origins of parasitism within the order. We conducted a phylogenomic analysis on the order Psocodea utilizing both transcriptome and genome sequencing to obtain a data set of 2370 orthologous genes. All phylogenomic analyses, including both concatenated and coalescent methods suggest a single origin of parasitism within the order Psocodea, resolving conflicting results from previous studies. This phylogeny allows us to propose a stable ordinal level classification scheme that retains significant taxonomic names present in historical scientific literature and reflects the evolution of the group as a whole. A dating analysis, with internal nodes calibrated by fossil evidence, suggests an origin of parasitism that predates the K-Pg boundary. Nucleotide compositional biases are detected in third and first codon positions and result in the anomalous placement of the Amphientometae as sister to Psocomorpha when all nucleotide sites are analyzed. Likelihood-mapping and quartet sampling methods demonstrate that base compositional biases can also have an effect on quartet-based methods.[Illumina; Phthiraptera; Psocoptera; quartet sampling; recoding methods.]
• Systematic Position of the Enigmatic Psocid Family Lesneiidae (Insecta: Psocodea: Psocomorpha), With Description of Two New Species
  Kazunori Yoshizawa; Yuri M Marusik; Izumi Yao; Charles Lienhard
  Insect Systematics and Diversity, 4, 6, 2020年11月01日, ［査読有り］
  英語, 研究論文（学術雑誌）
• The Trichadenotecnum corniculum species group from Thailand (Psocodea: Psocidae)
  Yoshizawa Kazunori; Charles Lienhard
  Dugesiana, 27, 2, 173, 181, Universidad de Guadalajara, 2020年07月01日, ［査読有り］
  研究論文（学術雑誌）, Five new species of the corniculum species group of the psocid genus Trichadenotecnum Enderlein, T. alfonsoi, T. lingens, T. palmula, T. affinifelix and T. separatum were described from Thailand. These species share a couple of male genital apomorphies with the other Oriental species of this species group recorded from China, Hong Kong, Malaysia, Singapore and Indonesia. The Japanese species of the corniculum group are considered to form a different clade placed to the sister of the Oriental species.
• Evolution of nuptial gifts and its coevolutionary dynamics with “masculine” female traits for multiple mating
  Yoshitaka Kamimura; Kazunori Yoshizawa; Charles Lienhard; Rodrigo L. Ferreira; Jun Abe
  bioRxiv, Cold Spring Harbor Laboratory, 2020年06月23日
  Many male animals donate nutritive materials during courtship or mating to their female mates. Donation of large-sized gifts, though costly to prepare, can result in increased sperm transfer during mating and delayed remating of the females, resulting in a higher paternity Nuptial gifting sometimes causes severe female-female competition for obtaining gifts (i.e., sex-role reversal in mate competition) and female polyandry, changing the intensity of sperm competition and the resultant paternity gains. We built a theoretical model to analyze such coevolutionary feedbacks between nuptial gift size (male trait) and propensity for multiple mating (female trait). Our genetically explicit, individual-based computer simulations demonstrate that a positive correlation between donated gift size and the resultant paternity gain is a requisite for the co-occurrence of large-sized gifts and females’ competitive multiple mating for the gifts. When donation of gifts imposes monandry, exaggeration in nuptial gift size also occurs under the assumption that the last male monopolizes paternity. We also analyzed the causes and consequences of the evolution of a female persistence trait in trading of nuptial gifts, that is, double receptacles for nuptial gifts known to occur in an insect group with a “female penis” (Neotrogla spp.).
• †Cormopsocidae: A new family of the suborder Trogiomorpha (Insecta: Psocodea) from Burmese amber
  Kazunori Yoshizawa; Charles Lienhard
  Entomological Science, 23, 2, 208, 215, Wiley, 2020年06月, ［査読有り］
  研究論文（学術雑誌）

• A revision of Strigiphilus (Insecta: Phthiraptera: Philopteridae) from Japan

  
  MEGUMI SHIMADA; KAZUNORI YOSHIZAWA
  Zootaxa, 4779, 4, 501, 521, Magnolia Press, 2020年05月21日, ［査読有り］
  研究論文（学術雑誌）, The Japanese species of the genus Strigiphilus Mjöberg, 1910 (Insecta: Phthiraptera: Philopteridae) are revised. Six species are recorded, including a new species belonging to the cursitans species-group: Strigiphilus stenocephalus new species, described from the type host Otus bakkamoena semitorques and based on specimens originally identified and reported by Uchida (1949) as Strigiphilus rostratus (Burmeister, 1838). A lectotype for Strigiphilus laticephalus (Uchida, 1949) (type host: Strix aluco yamadae) is designated and redescribed, and this louse species is synonymized under Strigiphilus cursor (Burmeister, 1838). Strigiphilus ceblebrachys (Denny, 1842), S. heterogenitalis Emerson & Elbel, 1957 and S. tuleskovi Balát, 1958 are recorded for the first time in Japan. Also, Strix uralensis and Otus sunia japonicus are recorded as new hosts for Strigiphilus heterogenitalis and S. tuleskovi respectively.
• The evolution of Zoraptera.
  Matsumura Y; Beutel RG; Rafael JA; Yao I; Camara JT; Lim Sp; Yoshizawa K
  Systematic Entomology, 45, 2, 349, 364, 2020年04月, ［査読有り］
  英語, 研究論文（学術雑誌）
• The cave insects with sex-reversed genitalia had their most recent common ancestor in West Gondwana (Psocodea: Prionoglarididae: Speleketorinae).
  Yoshizawa Kazunori; Charles Lienhard; Yao Izumi; Rodrigo Ferreira
  Entomological Science, 22, 3, 334, 338, 2019年09月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Microsatellite markers of sex-role-reversed cave dwelling insects, Neotrogla spp. (Psocodea: Prionoglarididae), developed by a next generation sequencing technique
  KAMIMURA Yoshitaka; ABE Jun; FERREIRA Rodrigo L; YOSHIZAWA Kazunori
  Entomological Science, 22, 1, 48, 55, Wiley, 2019年, ［査読有り］
  研究論文（学術雑誌）
• New records of chewing lice (Phthiraptera: Amblycera, Ischnocera) from the black-faced spoonbill (Platalea minor)
  Shimada, M; Yoshizawa, K
  Zootaxa, 4612, 1, 133, 137, Magnolia Press, 2019年, ［査読有り］
  英語, 研究論文（学術雑誌）, Three species of chewing lice—Eucolpocephalum femorale (Piaget, 1880) (Amblycera: Menoponidae), Ibidoecus plataleae (Denny, 1842) (Ischnocera: Philopteridae) and Ardeicola plataleae (Linnaeus, 1758) (Ischnocera: Philopteridae)—are reported from the black-faced spoonbill (Platalea minor Temminck & Schlegel, 1849) in Japan. These three louse species are new records for this host. The black-faced spoonbill is classified as a “Critically Endangered” species in the IUCN Red List; although its species of lice are known to infest other species of spoonbills, these lice are endangered at the population level.
• Functional morphology of Trichadenotecnum male and female genitalia analyzed using uCT
  Cheng Z; Yoshizawa K
  Journal of Morphology, 280, 555, 567, 2019年, ［査読有り］
  英語, 研究論文（学術雑誌）
• Why did a female penis evolve in a small group of cave insect
  Why did a female; penis evolve in; a; small; group of; cave insect
  BioEssays, 41, 6, 1900005, John Wiley and Sons Inc., 2019年, ［査読有り］, ［招待有り］
  英語, 研究論文（学術雑誌）
• A taxonomic review of the genus Metylophorus Pearman (Psocodea: Psocidae) in Japan, with description of three new species.
  Kido Miwa; Yoshizawa Kazunori
  Insecta matsumurana new series, 75, 19, 28, 2019年, ［査読有り］
  英語, 研究論文（大学，研究機関等紀要）
• Independent origins of female penis and its coevolution with male vagina in cave insects (Psocodea: Prionoglarididae)
  Yoshizawa, K; Ferreira, R; Yao, I; Lienhard, C; Kamimura, Y
  Biology Letters, 2018年11月, ［査読有り］
• Phylogenomics and the evolution of hemipteroid insects
  Kevin P. Johnson; Christopher H. Dietrich; Frank Friedrich; Rolf Beutel; Benjamin Wipfler; Ralph S. Peters; Julie M. Allen; Malte Petersen; Alexander Donath; Kimberly K. O. Walden; Alexey Kozlov; Lars Podsiadlowski; Christoph Mayer; Karen Meusemann; Alexandros Vasilikopoulos; Robert M. Waterhouse; Stephen Cameron; Christiane Weirauch; Daniel R. Swanson; Diana Percy; Nathaniel Hardy; Irene Terry; Shanlin Liu; Xin Zhou; Bernhard Misof; Hugh M. Robertson; Kazunori Yoshizawa
  PNAS, 115, 12775, 12780, 2018年11月, ［査読有り］
• A biological switching valve evolved in the female of a sex-role reversed cave insect to receive multiple seminal packages
  YOSHIZAWA, K; KAMIMURA, Y; LIENHARD, C; FERREIRA, R.L; BLANKE, A
  eLife, 2018年10月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Origin and transformation of the in-flight wing-coupling structure in Psocodea (Insecta: Paraneoptera)
  Naoki Ogawa; Kazunori Yoshizawa
  Journal of Morphology, 279, 4, 517, 530, John Wiley and Sons Inc., 2018年04月01日, ［査読有り］
  英語, 研究論文（学術雑誌）
• Mitochondrial phylogenomics and genome rearrangements in the barklice (Insecta: Psocodea)
  Kazunori Yoshizawa; Kevin P. Johnson; Andrew D. Sweet; Izumi Yao; Rodrigo L. Ferreira; Stephen L. Cameron
  Molecular Phylogenetics and Evolution, 119, 118, 127, Academic Press Inc., 2018年02月01日, ［査読有り］
  英語, 研究論文（学術雑誌）
• Structure and evolution of the stigmapophysis―a unique repose wing-coupling structure in Psocodea.
  Ogawa, N; Yoshizawa, K
  Arthropod Structure & Development, 47, 416, 422, Elsevier Ltd, 2018年, ［査読有り］
  英語, 研究論文（学術雑誌）
• Morphology of the elytral base sclerites
  SUGIMOTO Miwa; OGAWA Naomi; YOSHIZAWA Kazunori
  Arthropod Structure & Development, 2018年, ［査読有り］
• New oversize troglobitic species of Campodeidae in Japan (Diplura)
  Alberto Sendra; Kazunori Yoshizawa; Rodrigo Lopes Ferreira
  Subterranean Biology, 27, 53, 73, 2018年, ［査読有り］
• Phylogeography of the Japanese white-toothed shrew (Eulipotyphla: Soricidae): a clear division of haplogroups between eastern and western Japan and their recent introduction to some regions
  Satoshi D. Ohdachi; Kazunori Yoshizawa; Yasushi Takada; Masaharu Motokaw; Masahiro A. Iwasa; Satoru Arai; Junji Moribe; Yasushi Uematsu; Eiichi Sakai; Takashi Tateishi; Hong-Shik Oh; Gohta Kinoshita
  Mammal Study, 43, 2018年, ［査読有り］
• Morphological dissection of behavior: thoracic musculature clarifies independent development of jumping mechanisms between sister groups, planthoppers and leafhoppers (Insecta: Hemiptera: Auchenorrhyncha)
  Naoki Ogawa; Kazunori Yoshizawa
  ORGANISMS DIVERSITY & EVOLUTION, 17, 3, 521, 530, 2017年09月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Wing base structure supports Coleorrhyncha plus Auchenorrhyncha (Insecta: Hemiptera)
  Kazunori Yoshizawa; Naoki Ogawa; Christopher H. Dietrich
  JOURNAL OF ZOOLOGICAL SYSTEMATICS AND EVOLUTIONARY RESEARCH, 55, 3, 199, 207, 2017年08月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Multiple trans-Beringia dispersals of the barklouse genus Trichadenotecnum (Insecta: Psocodea: Psocidae)
  Kazunori Yoshizawa; Kevin P. Johnson; Izumi Yao; Jose Arturo Casasola Gonzalez; Emilie Bess; Alfonso Neri Garcia Aldrete
  BIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY, 121, 3, 501, 513, 2017年07月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Disjunct Occurrence of Trichadenotecnum s.str. in Southeastern Brazil (Psocodea: "Psocoptera": Psocidae), with Description of a New Species
  K. Yoshizawa; M. Souza-Silva; R. L. Ferreira
  NEOTROPICAL ENTOMOLOGY, 46, 2, 169, 174, 2017年04月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Bridging the gap between chewing and sucking in the hemipteroid insects: new insights from Cretaceous amber
  Kazunori Yoshizawa; Charles Lienhard
  ZOOTAXA, 4079, 2, 229, 245, 2016年02月, ［査読有り］
  英語, 研究論文（学術雑誌）
• First description of the male of Manicapsocus (Psocodea: 'Psocoptera': Electrentomidae)
  YOSHIZAWA Kazunori
  Insecta matsumurana, new series, 72, 95, 100, The Research Faculty of Agriculture, Hokkaido University, 2016年, ［査読有り］
  英語, 研究論文（学術雑誌）, The male of Manicapsocus alettae Smithers was recorded for the first time and its genital morphology was described and illustrated. This also represented the first report of the male of the genus. The highly specialized phallosome of M. alettae supported its close relationship with Epitroctes Mockford and Nothoentomum Badonnel, as previously suggested from general and female genital characters.
• Molecular phylogeny reveals genital convergences and reversals in the barklouse genus Trichadenotecnum (Insecta: Psocodea: 'Psocoptera': Psocidae)
  Kazunori Yoshizawa; Izumi Yao; Charles Lienhard
  MOLECULAR PHYLOGENETICS AND EVOLUTION, 94, 358, 364, 2016年01月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Maternal care in Acanthosomatinae (Insecta: Heteroptera: Acanthosomatidae) – correlated evolution with morphological change
  Tsai, J.F; Kudo, S; Yoshizawa, K
  BMC Evolutionary Biology, 15, 258, 2015年11月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Synonymy of Cryptopsocus Li with Trichadenotecnum Enderlein (Insecta: Psocodea: 'Psocoptera': Psocidae) and description of three new species
  Kazunori Yoshizawa; Charles Lienhard
  ZOOTAXA, 3957, 4, 480, 488, 2015年05月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Wing base morphology of Aetalionidae (Hemiptera: Cicadomorpha) and its phylogenetic implications
  Naoki Ogawa; Munetoshi Maruyama; Kazunori Yoshizawa
  ENTOMOLOGICAL SCIENCE, 18, 2, 262, 265, 2015年04月, ［査読有り］
  英語, 研究論文（学術雑誌）
• The alinguum group, a new species group of the genus Trichadenotecnum, with descriptions of two new species from Thailand (Psocodea: 'Psocoptera': Psocidae)
  Yoshizawa, K; Lienhard, C
  Insecta matsumurana, new series, 71, 179, 188, The Research Faculty of Agriculture, Hokkaido University, 2015年, ［査読有り］
  英語, 研究論文（学術雑誌）, The alinguum species group is newly proposed in the genus Trichadenotecnum (Psocidae: Ptyctini), and diagnosis of the species group is provided. Four named species, T. alinguum Endang, Thornton & New, T. laticornutum Endang, Thornton & New, T. sibolangitense Endang & New, and T. waykananense Endang & New are assigned to this species group. Two new species of the alinguum group, T. siamense and T. triceratum, are described and T. alinguum is newly recorded from Thailand.
• Phylogenomics resolves the timing and pattern of insect evolution
  Bernhard Misof; Shanlin Liu; Karen Meusemann; Ralph S. Peters; Alexander Donath; Christoph Mayer; Paul B. Frandsen; Jessica Ware; Tomas Flouri; Rolf G. Beutel; Oliver Niehuis; Malte Petersen; Fernando Izquierdo-Carrasco; Torsten Wappler; Jes Rust; Andre J. Aberer; Ulrike Aspoeck; Horst Aspoeck; Daniela Bartel; Alexander Blanke; Simon Berger; Alexander Boehm; Thomas R. Buckley; Brett Calcott; Junqing Chen; Frank Friedrich; Makiko Fukui; Mari Fujita; Carola Greve; Peter Grobe; Shengchang Gu; Ying Huang; Lars S. Jermiin; Akito Y. Kawahara; Lars Krogmann; Martin Kubiak; Robert Lanfear; Harald Letsch; Yiyuan Li; Zhenyu Li; Jiguang Li; Haorong Lu; Ryuichiro Machida; Yuta Mashimo; Pashalia Kapli; Duane D. McKenna; Guanliang Meng; Yasutaka Nakagaki; Jose Luis Navarrete-Heredia; Michael Ott; Yanxiang Ou; Guenther Pass; Lars Podsiadlowski; Hans Pohl; Bjoern M. von Reumont; Kai Schuette; Kaoru Sekiya; Shota Shimizu; Adam Slipinski; Alexandros Stamatakis; Wenhui Song; Xu Su; Nikolaus U. Szucsich; Meihua Tan; Xuemei Tan; Min Tang; Jingbo Tang; Gerald Timelthaler; Shigekazu Tomizuka; Michelle Trautwein; Xiaoli Tong; Toshiki Uchifune; Manfred G. Walzl; Brian M. Wiegmann; Jeanne Wilbrandt; Benjamin Wipfler; Thomas K. F. Wong; Qiong Wu; Gengxiong Wu; Yinlong Xie; Shenzhou Yang; Qing Yang; David K. Yeates; Kazunori Yoshizawa; Qing Zhang; Rui Zhang; Wenwei Zhang; Yunhui Zhang; Jing Zhao; Chengran Zhou; Lili Zhou; Tanja Ziesmann; Shijie Zou; Yingrui Li; Xun Xu; Yong Zhang; Huanming Yang; Jian Wang; Jun Wang; Karl M. Kjer; Xin Zhou
  SCIENCE, 346, 6210, 763, 767, 2014年11月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Phylogeny of the suborder Psocomorpha: congruence and incongruence between morphology and molecular data (Insecta: Psocodea: 'Psocoptera')
  Kazunori Yoshizawa; Kevin P. Johnson
  ZOOLOGICAL JOURNAL OF THE LINNEAN SOCIETY, 171, 4, 716, 731, 2014年08月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Trichadenotecnum species from Peninsular Malaysia and Singapore ( Insecta: Psocodea: 'Psocoptera': Psocidae)
  Kazunori Yoshizawa; Charles Lienhard; Idris Abd Ghani
  ZOOTAXA, 3835, 4, 469, 500, 2014年07月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Molecular phylogeny of the leaf beetle subfamily Criocerinae (Coleoptera: Chrysomelidae) and the correlated evolution of reproductive organs
  Yoko Matsumura; Izumi Yao; Rolf G. Beutel; Kazunori Yoshizawa
  ARTHROPOD SYSTEMATICS & PHYLOGENY, 72, 2, 95, 110, 2014年07月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Comparisons of Host Specificity in Feather Louse Genera (Insecta: Phthiraptera: Philopteridae) Parasitizing Gulls (Aves: Laridae: Larus)
  Ayaka Yamagishi; Izumi Yao; Kevin P. Johnson; Kazunori Yoshizawa
  ZOOLOGICAL SCIENCE, 31, 6, 383, 389, 2014年06月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Female Penis, Male Vagina, and Their Correlated Evolution in a Cave Insect
  Kazunori Yoshizawa; Rodrigo L. Ferreira; Yoshitaka Kamimura; Charles Lienhard
  CURRENT BIOLOGY, 24, 9, 1006, 1010, 2014年05月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Two intromittent organs in Zorotypus caudelli (Insecta, Zoraptera): the paradoxical coexistence of an extremely long tube and a large spermatophore
  Yoko Matsumura; Kazunori Yoshizawa; Ryuichiro Machida; Yuta Mashimo; Romano Dallai; Marco Gottardo; Thomas Kleinteich; Jan Michels; Stanislav N. Gorb; Rolf G. Beutel
  BIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY, 112, 1, 40, 54, 2014年05月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Molecular systematics of the bark lice infraorder Caeciliusetae (Insecta: Psocodea)
  Kazunori Yoshizawa; Edward L. Mockford; Kevin P. Johnson
  SYSTEMATIC ENTOMOLOGY, 39, 2, 279, 285, 2014年04月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Evolution of attachment structures in the highly diverse Acercaria (Hexapoda)
  Katrin Friedemann; Rico Spangenberg; Kazunori Yoshizawa; Rolf G. Beutel
  CLADISTICS, 30, 2, 170, 201, 2014年04月, ［査読有り］
  英語, 研究論文（学術雑誌）
• [Invited Commentary] A transgender Brazilian cave insect.
  Yoshizawa K; Ferreira R.L; Kamimura Y; Lienhard C
  The Winnower, 2014年, ［査読有り］, ［招待有り］
  英語, 研究論文（学術雑誌）
• 100 years Zoraptera-a phantom in insect evolution and the history of its investigation
  Y. Mashimo; Y. Matsumura; R. Machida; R. Dallai; M. Gottardo; K. Yoshizawa; F. Friedrich; B. Wipfler; R. G. Beutel
  INSECT SYSTEMATICS & EVOLUTION, 45, 4, 371, 393, 2014年, ［査読有り］
  英語, 研究論文（学術雑誌）
• Changes in base composition bias of nuclear and mitochondrial genes in lice (Insecta: Psocodea)
  Kazunori Yoshizawa; Kevin P. Johnson
  GENETICA, 141, 10-12, 491, 499, 2013年12月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Zorotypus in Peninsular Malaysia (Zoraptera: Zorotypidae), with the description of three new species
  Yuta Mashimo; Kazunori Yoshizawa; Michael S. Engel; Idris Abd Ghani; Romano Dallai; Rolf G. Beutel; Ryuichiro Machida
  ZOOTAXA, 3717, 4, 498, 514, 2013年10月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Atrichadenotecnum multispinosus sp n. (Psocoptera: Psocidae) from southwestern China, with new synonyms and new combinations from Psocomesites and Clematostigma
  Luxi Liu; Kazunori Yoshizawa; Fasheng Li; Zhiqi Liu
  ZOOTAXA, 3701, 4, 460, 466, 2013年08月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Parallel evolution of novelties: extremely long intromittent organs in the leaf beetle subfamily Criocerinae
  Yoko Matsumura; Ryuichiro Machida; Benjamin Wipfler; Rolf G. Beutel; Kazunori Yoshizawa
  EVOLUTION & DEVELOPMENT, 15, 4, 305, 315, 2013年07月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Intraspecific phylogeny and nucleotide diversity of the least shrews, the Sorex minutissimus-S. yukonicus complex, based on nucleotide sequences of the mitochondrial cytochrome b gene and the control region
  Satoshi D. Ohdachi; Kazunori Yoshizawa; Ilkka Hanski; Kuniko Kawai; Nikolai E. Dokuchaev; Boris I. Sheftel; Alexei V. Abramov; Igor Moroldoevs; Atsushi Kawahara
  MAMMAL STUDY, 37, 4, 281, 297, 2012年12月
  英語, 研究論文（学術雑誌）
• 生きた化石, ムカシトンボの由来
  吉澤 和徳
  化学と生物, 50, 11, 840, 843, 日本農芸化学会 ; 1962-, 2012年11月01日
  日本語
• REDESCRIPTION OF SYMBIOPSOCUS HASTATUS MOCKFORD (PSOCODEA: "PSOCOPTERA": PSOCIDAE), WITH FIRST DESCRIPTION OF FEMALE AND COMMENTS ON THE GENUS
  YOSHIZAWA Kazunori; MOCKFORD Edward L
  Insecta Matsumurana New Ser, 68, 68, 133, 141, Research faculty of agriculture, Hokkaido University, 2012年10月
  英語, Symbiopsocus hastatus was described based only on two males from KunashiriIsland. Here we redescribe the species based on the specimens collected throughout the Japanese Archipelago, with first description of females. Morphological examinations showed that the species is closely related to Mecampsis multimacularis Li from China. The type species of Mecampsis is endemic to Chile and, except for 10 Chinese species described recently, distributional ranges of all the species are restricted to South America and the Greater Antilles. These distributional areas of Mecampsis are widely disjunct and thus assignments of the Chinese species to this genus are highly questionable. Rather, judging from the phallosomal and hypandrial apomorphies, closer relationship between the Chinese Mecampsis with Symbiopsocus is likely. Therefore, all the Chinese species of Mecampsis are here transferred to Symbiopsocus. Symbiopsocus sturmi (Badonnel) is transferred back to its original genus, Psocomesites.
• Phylogenetic relationships among superfamilies of Cicadomorpha (Hemiptera: Auchenorrhyncha) inferred from the wing base structure
  Kazunori Yoshizawa; Mutsumi Wagatsuma
  ENTOMOLOGICAL SCIENCE, 15, 4, 408, 421, 2012年10月
  英語, 研究論文（学術雑誌）
• Co-phylogeography and morphological evolution of sika deer lice (Damalinia sika) with their hosts (Cervus nippon)
  Atsushi Mizukoshi; Kevin P. Johnson; Kazunori Yoshizawa
  PARASITOLOGY, 139, 12, 1614, 1629, 2012年10月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Homology of the internal sac components in the leaf beetle subfamily criocerinae and evolutionary novelties related to the extremely elongated flagellum
  Yoko Matsumura; Kazunori Yoshizawa
  JOURNAL OF MORPHOLOGY, 273, 5, 507, 518, 2012年05月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Phylogeographic Analysis Elucidates the Influence of the Ice Ages on the Disjunct Distribution of Relict Dragonflies in Asia
  Sebastian Buesse; Philipp von Grumbkow; Susanne Hummel; Deep Narayan Shah; Ram Devi Tachamo Shah; Jingke Li; Xueping Zhang; Kazunori Yoshizawa; Sonja Wedmann; Thomas Hoernschemeyer
  PLOS ONE, 7, 5, e38132, 2012年05月, ［査読有り］
  英語, 研究論文（学術雑誌）
• The treehopper's helmet is not homologous with wings (Hemiptera: Membracidae)
  Kazunori Yoshizawa
  SYSTEMATIC ENTOMOLOGY, 37, 1, 2, 6, 2012年01月
  英語, 研究論文（学術雑誌）
• A review of the genus Neopsocopsis (Psocodea, "Psocoptera", Psocidae), with one new species from China.
  Liu LX; Yoshizawa K; Li FS; Liu ZQ
  ZooKeys, 203, 27, 46, 2012年, ［査読有り］
  英語
• REVISION OF THE GENUS OSMYLUS (NEUROPTERA: OSMYLIDAE: OSMYLINAE) OF JAPAN
  SEKIMOTO Shigeyuki; YOSHIZAWA Kazunori
  Insecta Matsumurana New Ser, 67, 67, 1, 22, Research Faculty of Agriculture, Hokkaido University, 2011年10月
  英語, Japanese species of Osmylus were recognized: O. (O.) pryeri McLachlan, 1875, O. (O.) hyalinatus McLachlan, 1875 and O. (O.) decoratus Nakahara, 1914. One species of the subgenus Plesiosmylus Makarkin, O. (P.) tessellatus McLachlan, 1875 was recognized. All Japanese species of Osmylus were redescribed and illustrated but O. kisoensis Iwara, 1928, which is known only from a larva to date, was not treated here. A key to the Japanese species of the genus is provided. In Appendix, two new combinations were proposed for two Chinese species, O. atomatus (Yang, 1988) and O. zheanus (Yang & Liu, 2001)(both originally assigned in the genus Plethosmylus Kruger).
• Multiple lineages of lice pass through the K-Pg boundary
  Vincent S. Smith; Tom Ford; Kevin P. Johnson; Paul C. D. Johnson; Kazunori Yoshizawa; Jessica E. Light
  BIOLOGY LETTERS, 7, 5, 782, 785, 2011年10月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Mitochondrial genome deletions and minicircles are common in lice (Insecta: Phthiraptera)
  Stephen L. Cameron; Kazunori Yoshizawa; Atsushi Mizukoshi; Michael F. Whiting; Kevin P. Johnson
  BMC GENOMICS, 12, 394, 2011年08月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Monophyletic Polyneoptera recovered by wing base structure
  Kazunori Yoshizawa
  SYSTEMATIC ENTOMOLOGY, 36, 3, 377, 394, 2011年07月
  英語, 研究論文（学術雑誌）
• The utility of indels in population genetics: The Tpi intron for host race genealogy of Acrocercops transecta (Insecta: Lepidoptera)
  Issei Ohshima; Kazunori Yoshizawa
  MOLECULAR PHYLOGENETICS AND EVOLUTION, 59, 2, 469, 476, 2011年05月, ［査読有り］
  英語, 研究論文（学術雑誌）
• 直接最適化法direct optimizationの問題点
  吉澤 和徳
  タクサ : 日本動物分類学会誌, 0, 30, 17, 29, 日本動物分類学会, 2011年02月20日
  日本語, Problems in direct optimization method as implemented in the software POY were reviewed. Alignment of highly variable regions using POY is problematic because it likely provides artificial maximization of pseudo-homology within the alignment. If the variable regions are aligned with conserved regions, then the bias could be emerged in two ways. When the conserved regions contain only weak phylogenetic signal, then stochastic similarities within the variable regions strongly affect to the final alignment. This type of bias can be emerged even if the variable regions are aligned independently...
• Kaindipsocinae is a sister taxon to the rest of Psocidae (Insecta: Psocodea: 'Psocoptera')
  Kazunori Yoshizawa; Emilie Bess; Kevin P. Johnson
  INVERTEBRATE SYSTEMATICS, 25, 2, 81, 90, 2011年
  英語, 研究論文（学術雑誌）
• SYSTEMATIC REVISION OF THE JAPANESE SPECIES OF THE SUBFAMILY AMPHIGERONTIINAE (PSOCODEA: 'PSOCOPTERA': PSOCIDAE)
  YOSHIZAWA Kazunori
  Insecta Matsumurana New Ser, 66, 66, 11, 36, Research Faculty of Agriculture, Hokkaido University, 2010年10月
  英語
• In search of the sister group of the true lice: A systematic review of booklice and their relatives, with an updated checklist of Liposcelididae (Insecta: Psocodea)
  Kazunori Yoshizawa; Charles Lienhard
  ARTHROPOD SYSTEMATICS & PHYLOGENY, 68, 2, 181, 195, 2010年06月
  英語
• How stable is the "Polyphyly of Lice" hypothesis (Insecta: Psocodea)?: A comparison of phylogenetic signal in multiple genes
  Kazunori Yoshizawa; Kevin P. Johnson
  MOLECULAR PHYLOGENETICS AND EVOLUTION, 55, 3, 939, 951, 2010年06月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Differential introgression causes genealogical discordance in host races of Acrocercops transecta (Insecta: Lepidoptera)
  Issei Ohshima; Kazunori Yoshizawa
  MOLECULAR ECOLOGY, 19, 10, 2106, 2119, 2010年05月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Direct optimization overly optimizes data
  Kazunori Yoshizawa
  SYSTEMATIC ENTOMOLOGY, 35, 2, 199, 206, 2010年04月
  英語, 研究論文（学術雑誌）
• Insertion and withdrawal of extremely elongated genitalia: a simple mechanism with a highly modified morphology in the leaf beetle, Lema coronata
  Yoko Matsumura; Kazunori Yoshizawa
  BIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY, 99, 3, 512, 520, 2010年03月
  英語, 研究論文（学術雑誌）
• Description of a new species of the Trichadenotecnum roesleri species group from Brazil (Insecta: Psocodea: "Psocoptera": Psocidae) and its phylogenetic implications
  Kazunori Yoshizawa; Alfonso Neri Garcia Aldrete
  STUDIES ON NEOTROPICAL FAUNA AND ENVIRONMENT, 45, 1, 61, 66, 2010年
  英語, 研究論文（学術雑誌）
• DESCRIPTION OF KIMUNPSOCUS TAKUMAI N. GEN. & N. SP. FROM HOKKAIDO, JAPAN (PSOCODEA: 'PSOCOPTERA': PSOCIDAE: PTYCTINI)
  YOSHIZAWA Kazunori
  Insecta Matsumurana New Ser, 65, 65, 149, 155, Research Faculty of Agriculture, Hokkaido University, 2009年08月
  英語, A new genus and species of the tribe Ptyctini, Kimunpsocus takumai, was described based on the specimens collected in Hokkaido, Japan. Morphologically, Kimunpsocus is apparently a member of the tribe Ptyctini and is similar to Loensia in the forewing markings and venation. However, independence of this new genus was supported morphologically and molecularly.
• A revised interpretation of the wing base structure in Odonata
  Tomoya Ninomiya; Kazunori Yoshizawa
  SYSTEMATIC ENTOMOLOGY, 34, 2, 334, 345, 2009年04月
  英語, 研究論文（学術雑誌）
• Systematics and biogeography of the New World species of Trichadenotecnum Enderlein (Insecta : Psocodea : 'Psocoptera': Psocidae)
  Kazunori Yoshizawa; Alfonso Neri Garcia Aldrete; Edward L. Mockford
  ZOOLOGICAL JOURNAL OF THE LINNEAN SOCIETY, 153, 4, 651, 723, 2008年08月
  英語, 研究論文（学術雑誌）
• SYSTEMATIC POSITIONS OF THE SPECIES CURRENTLY PLACED UNDER THE HOLDING GENUS PSOCIDUS S.L. DESCRIBED BY OKAMOTO (PSOCODEA: 'PSOCOPTERA': PSOCIDAE)
  YOSHIZAWA Kazunori
  Insecta Matsumurana New Ser, 64, 64, 23, 34, RESEARCH FACULTY OF AGRICULTURE, HOKKAIDO UNIVERSITY, 2008年03月
  英語
• Molecular systematics of the barklouse family Psocidae (Insecta : Psocodea : 'Psocoptera') and implications for morphological and behavioral evolution
  Kazunori Yoshizawa; Kevin P. Johnson
  MOLECULAR PHYLOGENETICS AND EVOLUTION, 46, 2, 547, 559, 2008年02月
  英語, 研究論文（学術雑誌）
• Molecular systematics of the barklouse family Psocidae (Insecta : Psocodea : 'Psocoptera') and implications for morphological and behavioral evolution
  Kazunori Yoshizawa; Kevin P. Johnson
  MOLECULAR PHYLOGENETICS AND EVOLUTION, 46, 2, 547, 559, 2008年02月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Systematic positions of the species currently placed under the holding genus Psocidus s.l. described by Okamoto (Psocodea: 'Psocoptera': Psocidae).
  Insecta Matsumurana, New Series, 64, 23, 34, 2008年
• Bacterial endosymbiont of the slender pigeon louse, Columbicola columbae, allied to endosymbionts of grain weevils and tsetse flies
  Takema Fukatsu; Ryuichi Koga; Wendy A. Smith; Kohjiiro Tanaka; Naruo Nikoh; Kayoko Sasaki-Fukatsu; Kazunori Yoshizawa; Colin Dale; Dale H. Clayton
  APPLIED AND ENVIRONMENTAL MICROBIOLOGY, 73, 20, 6660, 6668, 2007年10月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Redefinition of Ptycta Enderlein (Psocodea : "Psocoptera" : Psocidae) and taxonomic revision of the Japanese species
  Emilie C. Bess; Kazunori Yoshizawa
  ENTOMOLOGICAL SCIENCE, 10, 3, 279, 290, 2007年09月
  英語, 研究論文（学術雑誌）
• Homology of the wing base sclerites in Ephemeroptera (Insecta: Pterygota) - a reply to Willkommen and Hörnschemeyer.
  Yoshizawa K; Ninomiya T
  Arthropod structure & development, 36, 3, 277, 279, 2007年09月, ［査読有り］
  英語, 研究論文（学術雑誌）
• The Zoraptera problem: evidence for Zoraptera plus Embiodea from the wing base
  Kazunori Yoshizawa
  SYSTEMATIC ENTOMOLOGY, 32, 2, 197, 204, 2007年04月
  英語, 研究論文（学術雑誌）
• Discovery of the genus Suhpalacsa Lefebvre (Neuroptera : Ascalaphidae : Ascalaphinae) in Japan, with description of a new species
  Shigeyuki Sekimoto; Kazunori Yoshizawa
  ENTOMOLOGICAL SCIENCE, 10, 1, 81, 86, 2007年03月
  英語, 研究論文（学術雑誌）
• SYSTEMATIC STUDY OF THE GENUS TRICHADENOTECNUM IN NEPAL (PSOCODEA: 'PSOCOPTERA': PSOCIDAE)
  YOSHIZAWA Kazunori; LIENHARD Charles; THAPA Vasant Kumar
  Insecta Matsumurana New Ser, 63, 63, 1, 33, FACULTY OF AGRICULTURE, HOKKAIDO UNIVERSITY, 2007年02月
  英語, Nepalese species of the genus Trichadenotecnum Enderlein are revised. A total of 16species are recognized of which six are newly described: Trichadenotecnum isseii n. sp.,T. suwai n. sp., and T. danieli n. sp. belonging to the spiniserrulum group, T. nepalense n.sp. and T. depitarense n. sp. belonging to the newly established distinctum group, and T.malickyi n. sp. belonging to the newly established digitatum group. T. distinctum Datta,originally described from India, and T. sclerotum New, originally described from Bhutan,are newly recorded from Nepal. Four possibly undescribed species are also recognized;however, these species are not named here because they are represented only by femalespecimens. One of these species belongs to the newly established longimucronatumgroup, which was formerly recognized as an independent genus, Conothoracalis Li, herenewly synonymized with Trichadenotecnum. The holotype male of T. masoni New andthe allotype male of T. godavarense New are considered to be "chimeras" composed ofgeneral body parts of one species and male terminalia of the other species. Therefore,terminal parts of the holotype male of T. masoni are here excluded from the holotype.Several new generic combinations and species group assignments are also proposed fornon-Nepalese species.
• Systematic position of Trichadenotecnum enderleini (Roesler) (Psocodea: "Psocoptera": Psocidae)
  Kazunori Yoshizawa; Courtenay N. Smithers
  Records of the Australian Museum, 58, 3, 411, 415, Scientific Publications, 2006年11月29日, ［査読有り］
  英語, 研究論文（学術雑誌）
• Systematic position of Trichadenotecnum enderleini (Roesler) (Psocodea : "Psocoptera": Psocidae)
  Kazunori Yoshizawa; Courtenay N. Smithers
  RECORDS OF THE AUSTRALIAN MUSEUM, 58, 3, 411, 415, 2006年11月
  英語, 研究論文（学術雑誌）
• Symbiotic bacteria associated with stomach discs of human lice
  Kayoko Sasaki-Fukatsu; Ryuichi Koga; Naruo Nikoh; Kazunori Yoshizawa; Shinji Kasai; Minoru Mihara; Mutsuo Kobayashi; Takashi Tomita; Takerna Fukatsu
  APPLIED AND ENVIRONMENTAL MICROBIOLOGY, 72, 11, 7349, 7352, 2006年11月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Morphology of male genitalia in lice and their relatives and phylogenetic implications
  K Yoshizawa; KP Johnson
  SYSTEMATIC ENTOMOLOGY, 31, 2, 350, 361, 2006年04月
  英語, 研究論文（学術雑誌）
• Molecular systematics of the suborder Trogiomorpha (Insecta : Psocodea : 'Psocoptera')
  K Yoshizawa; C Lienhard; KP Johnson
  ZOOLOGICAL JOURNAL OF THE LINNEAN SOCIETY, 146, 2, 287, 299, 2006年02月
  英語, 研究論文（学術雑誌）
• Multiple host shifts between distantly related plants, Juglandaceae and Ericaceae, in the leaf-mining moth Acrocercops leucophaea complex (Lepidoptera : Gracillariidae)
  Ohshima, I; K Yoshizawa
  MOLECULAR PHYLOGENETICS AND EVOLUTION, 38, 1, 231, 240, 2006年01月, ［査読有り］
  英語, 研究論文（学術雑誌）
• On the systematic position of Podopterocus Banks and Dinopsocus Banks, with a revised diagnosis of the genus Sigmatoneura Enderlein (Psocodea : 'Psocoptera': Psocidae)
  K Yoshizawa; C Lienhard; AB Idris
  REVUE SUISSE DE ZOOLOGIE, 112, 4, 831, 848, 2005年12月
  英語, 研究論文（学術雑誌）
• MORPHOLOGY OF PSOCOMORPHA (PSOCODEA: 'PSOCOPTERA')
  YOSHIZAWA Kazunori
  Insecta Matsumurana New Ser, 62, 62, 1, 44, 北海道大学, 2005年12月
  英語, Adult integumental morphology of the suborder Psocomorpha (Psocodea:'Psocoptera') was examined, and homologies and transformation series of charactersthroughout the suborder and Psocoptera were discussed. These examinations formed thebasis of the recent morphology-based cladistic analysis of the Psocomorpha (Yoshizawa,2002, Zool. J. Linn. Soc. 136: 371–400).
• Aligned 18S for Zoraptera (Insecta): Phylogenetic position and molecular evolution
  K Yoshizawa; KP Johnson
  MOLECULAR PHYLOGENETICS AND EVOLUTION, 37, 2, 572, 580, 2005年11月, ［査読有り］
  英語, 研究論文（学術雑誌）
• A report on the faunal survey of insects and arachnids living on the rainforest canopy of the Malay Peninsula.
  Serangga, 10, 37, 48, 2005年
• 房総半島に生息するニホンザル(Macaca fuscata)の寄生虫症および感染症に関する予備調査(寄生虫学)
  里吉 亜也子; 蒲谷 肇; 萩原 光; 谷山 弘行; 吉澤 和徳; 辻 正義; 萩原 克郎; 村松 康和; 浅川 満彦
  Japanese journal of zoo and wildlife medicine, 9, 2, 79, 83, 日本野生動物医学会, 2004年09月
  日本語, 千葉県房総半島にはアカゲザル(Macaca mulatta)と疑われるサル類が生息する。この外来種のサル類の存在により,在来種であるニホンザルへの新たな寄生体感染の危険性も指摘されている。そこで,この基礎情報として当該地域におけるニホンザルの寄生生物の保有状況を把握するため,有害駆除されたニホンザル50個体について,寄生虫(節足動物,蠕虫および原虫)全般および一部ウイルス・細菌の検査を実施した。その結果,Pedicinus obtusus, P.eurygaster, Streptopharagus pigmentatus, Storongyloides fulleborniおよびTrichuris trichiuraの5種の寄生虫が認められた。いずれもニホンザルにおいて既に報告のある種であった。シラミ類Pedicinus属2種の濃厚寄生が認められた個体については,両種の詳細な寄生部位の記録を行なった。今回の調査では,コクシジウム類とBabesia属の寄生は認められなかった。Rickettsia,Coxciellaおよびボルナウイルスの感染状況については,別に報告予定である。
• Multiple origins of parasitism in lice
  KP Johnson; K Yoshizawa; VS Smith
  PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES, 271, 1550, 1771, 1776, 2004年09月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Molecular phylogeny of major lineages of Trichadenotecnum and a review of diagnostic morphological characters (Psocoptera : Psocidae)
  K Yoshizawa
  SYSTEMATIC ENTOMOLOGY, 29, 3, 383, 394, 2004年07月
  英語, 研究論文（学術雑誌）
• The first record of sucking louse, Neohaematopinus callosciuri, infesting Pallas squirrels in Japan
  Y Shinozaki; K Yoshizawa; K Murata; T Shiibashi; J Kimura; S Maruyama; Y Hayama; H Yoshida; S Nogami
  JOURNAL OF VETERINARY MEDICAL SCIENCE, 66, 3, 333, 335, 2004年03月
  英語, 研究論文（学術雑誌）
• Ectoparasites of the Pallas squirrel, Callosciurus erythraeus, introduced to Japan
  Y Shinozaki; T Shiibashi; K Yoshizawa; K Murata; J Kimura; S Maruyama; Y Hayama; H Yoshida; S Nogami
  MEDICAL AND VETERINARY ENTOMOLOGY, 18, 1, 61, 63, 2004年03月
  英語, 研究論文（学術雑誌）
• The first record of sucking louse, Neohaematopinus callosciuri, infesting Pallas squirrels in Japan
  Y Shinozaki; K Yoshizawa; K Murata; T Shiibashi; J Kimura; S Maruyama; Y Hayama; H Yoshida; S Nogami
  JOURNAL OF VETERINARY MEDICAL SCIENCE, 66, 3, 333, 335, 2004年03月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Systematics of Trichadenotecnum (Psocoptera: Psocidae) in Hong Kong
  Publicaciones Especiales del Instituto de Biologia, Universidad Nacional Autonoma de Mexico, 20, 121, 149, 2004年
• Phylogenetic position of Phthiraptera (Insecta : Paraneoptera) and elevated rate of evolution in mitochondrial 12S and 16S rDNA
  K Yoshizawa; KP Johnson
  MOLECULAR PHYLOGENETICS AND EVOLUTION, 29, 1, 102, 114, 2003年10月, ［査読有り］
  英語, 研究論文（学術雑誌）
• Reinterpretations of clypeus and maxilla in Psocoptera, and their significance in phylogeny of Paraneoptera (Insecta : Neoptera)
  K Yoshizawa; T Saigusa
  ACTA ZOOLOGICA, 84, 1, 33, 40, 2003年01月
  英語, 研究論文（学術雑誌）
• Two new species that are likely to represent the most basal clade of the genus Trichadenotecnum (Psocoptera: Psocidae)
  Entomological Science, 6, 301, 308, 2003年
• Phylogeny and higher classification of suborder Psocomorpha (Insecta : Psocodea : 'Psocoptera')
  K Yoshizawa
  ZOOLOGICAL JOURNAL OF THE LINNEAN SOCIETY, 136, 3, 371, 400, 2002年11月
  英語, 研究論文（学術雑誌）
• Type specimens of Psocoptera described by H. Okamoto in Hokkaido University Insect Collection
  YOSHIZAWA KAZUNORI
  Insecta Matsumurana New Series, 59, 29, 38, 北海道大学, 2002年
  英語, YOSHIZAWA, K. 2002. Type specimens of Psocoptera described by H. Okamoto in Hokkaido University Insect Collection. Ins. matsum. n. s. 59: 29-38. Psocid species described by Hanjiro Okamoto are listed. Type specimens of 20 species of the altogether 34 Okamoto's psocid species are confirmed to exist in the Hokkaido University Insect Collection.
• Systematic study of Amphipsocidae in Japan (Psocodea:'Psocoptera': Caeciliusetae), with comments on higher classification within the family
  Yoshizawa Kazunori
  Insecta Matsumurana New Series, 58, 1, 25, 北海道大学, 2001年
  英語
• Phylogenetic analysis of paraneopteran orders (Insecta : Neoptera) based on forewing base structure, with comments on monophyly of Auchenorrhyncha (Hemiptera)
  K Yoshizawa; T Saigusa
  SYSTEMATIC ENTOMOLOGY, 26, 1, 1, 13, 2001年01月
  英語, 研究論文（学術雑誌）
• A systematic revision of Japanese Trichadenotecnum Enderlein (Psocodea : 'Psocoptera': Psocidae : Ptyctini), with redefinition and subdivision of the genus
  K Yoshizawa
  INVERTEBRATE TAXONOMY, 15, 2, 159, 204, 2001年
  英語, 研究論文（学術雑誌）
• 皇居の動物相調査で得られたチャタテムシ目昆虫
  国立科学博物館専報, 36, 29, 34, 2000年
• Redescription ofMepleres suzukii (Okamoto), with comments on synonymy amongMepleres,Pseudoscottiella andMeniscopsocus (Psocodea: "Psocoptera": Pseudocaeciliidae)
  Yoshizawa Kazunori
  Entomological Science, 3, 4, 669, 674, Entomological Society of Japan, 2000年
  英語, Mepleres suzukii (Okamoto, 1910)(Psocoptera : Pseudocaeciliidae) was redescribed. Mepleres Enderlein, 1926 had been incorrectly treated by some authors as an invalid synonym of Pseudoscottiella Badonnel, 1946. Thus, Pseudoscottiella was appropriately treated here as a junior synonym of Mepleres. Meniscopsocus Li, 1993 was newly synonymized with Mepleres. All new species combinations resulting from these taxonomic treatments were listed. Within Mepleres, African and Oriental-Pacific-Australian species groups had been recognized, with Mep. suzukii assigned to the latter group. However, monophyly of the latter group could not be justified, whereas the African group was regarded as monophyletic. A key to Japanese Mepleres was provided.
• A new genus, Atrichadenotecnum, of the tribe Psocini (Psocoptera : Psocidae) and its systematic position
  K Yoshizawa
  ENTOMOLOGICA SCANDINAVICA, 29, 2, 199, 209, 1998年
  英語, 研究論文（学術雑誌）
• Taxonomic study of the genusMesopsocus (Psocoptera: Mesopsocidae) of Japan
  Entomological Science, 1, 265, 269, 1998年
• On the nest ofStenopsocus externus Banks (Psocoptera: Stenopsocidae)
  Yoshizawa Kazunori; Saigusa Toyohei
  Japanese Journal of Entomology, 65, 1, 168, 170, 東京昆蟲學會, 1997年
  英語
• A new genus,Idatenopsocus, of the family Mesopsocidae (Insecta: Psocoptera) and its phylogenetic position
  Species Diversity, 2, 51, 58, 1997年
• Psocoptera of Bangladesh collected by Prof. Emer. Katsura Morimoto, with descriptions of four new species
  Esakia, 37, 15, 24, 1997年
• Taxonomic study on the family Pseudocaeciliidae (Psocoptera: Psocomorpha) from Japan. 2. GeneraHeterocaecilius andPhallocaecilius
  YOSHIZAWA Kazunori
  Japanese Journal of Entomology, 64, 1, 3, 16, 東京昆蟲學會, 1996年
  英語, The genera Heterocaecilius and Phallocaecilius of Japan are dealt with. H. solocipennis is transferred from the genus Pseudocaecilius and redescribed. A new species, Heterocaecilius fuscus, is described. Phallocaecilius hirsutus is recorded from Japan for the first time and redescribed. This is also the first record of the genus Phallocaecilius from Japan. Male and female genitalia are illustrated for the three species. Diagnostic characters of the genera and a key to the Japanese species of the genus Heterocaecilius are provided. This paper is the second part of the study of the Japanese Pseudocaeciliidae.
• Taxonomic study on the family Pseudocaeciliidae (Psocoptera: Psocomorpha) from Japan. 3. GeneraAllocaecilius,Ophiodoperma andPseudoscottiella
  Japanese Journal of Entomology, 64, 300, 312, 1996年
• First record ofReuterella helvimacula (Enderlein) (Psocoptera: Elipsocidae) from Japan
  YOSHIZAWA K.
  Japanese Journal of Entomology, 64, 187, 188, 1996年
• Taxonomic study on the family Pseudocaeciliidae (Psocoptera: Psocomorpha) from Japan. 1. Revision of the genus Pseudocaecilius
  YOSHIZAWA Kazunori
  Japanese Journal of Entomology, 63, 4, 703, 721, 東京昆蟲學會, 1995年
  英語, The genus Pseudocaecilius of Japan is revised. Three species, P. citricola, P. kagoshimensis and P. maculosus are redescribed and a new subspecies, P. kagoshimensis yaeyamensis, is described. Male and female genitalia are illustrated for each taxon, as far as the materials are available. Generic diagnostic characters and a key to Japanese species and subspecies are provided. This paper is the first part of the study of the Japanese Pseudocaeciliidae.
• New records of the Psocoptera from Yakutia, Russia
  Bulletin of the Biogeographical Society of Japan, 50, 19, 22, 1995年

• 昆虫学概論・各目解説(1)咀顎目(カジリムシ目)の系統的位置と高次体系
  吉澤 和徳, 昆蟲. ニューシリーズ, 19, 3, 112, 120, 2016年07月05日
  日本昆虫学会, 日本語
• フォーラム 雌ペニス発見の経緯と進化学へのインパクトおよび昆虫の交尾ペアの観察手法の紹介
  吉澤 和徳, 昆蟲. ニューシリーズ, 18, 1, 8, 16, 2015年01月05日
  日本昆虫学会, 日本語
• Revised classification of 'Psocoptera' from Cretaceous amber, a reassessment of published information
  Mockford Edward L.; Lienhard Charles; Yoshizawa Kazunori, Insecta matsumurana. Series entomology. New series : journal of the Faculty of Agriculture Hokkaido University, 69, 1, 26, 2013年10月
  All fossil psocid species ('Psocoptera', i. e. free living, mostly bark-dwelling members of the insect order Psocodea) known from Cretaceous amber are listed and their systematic placement is discussed. This critical evaluation of published data resulted in a list of 32 species assignable to 27 genera and 11 families. Each genus could be assigned to one of the three suborders Trogiomorpha, Troctomorpha andPsocomorpha, but five genera could not clearly be assigned to a family. No extant genus is represented in Cretaceous amber. Several systematic misallocations, a fewat subordinal level, have been identified. Suborder transfers are proposed for the genera Paramesopsocus, Arcantipsocus and Libanopsyllipsocus; an infraorder transfer within Troctomorpha is proposed for Globopsacus. The extant troctomorph family Pachytroctidae is recorded for the first time from the Cretaceous. Two family-group names of Psocomorpha (Paramesopsocidae and Arcantipsocidae), based on extinct taxa, are considered as synonyms of two extant families of Troctomorpha (Electrentomidae and Amphientomidae respectively). The extant family Lachesillidae is the only family of Psocomorpha represented in Cretaceous amber. 53% of the species from Cretaceous amber belong to the Trogiomorpha, representing the basal clade of Psocoptera; 41%belong to Troctomorpha and only 6% to Psocomorpha, while the latter comprises 69% of the species known from Baltic amber (Eocene) and 82% of the extant species. The presence of the family Lachesillidae shows that the deepest divergences of the psocomorphan phylogeny date back at least to the Cretaceous, but the main radiation of Psocomorpha at generic or species level probably happened in the Cenozoic. This critical review of published information about the oldest known fossils clearly assignable to the order Psocodea (as this group is defined by taxonomists working on the extant fauna) aims to refine the data which could provide some fossil evidence for calibration ofmolecular trees in future research on the phylogeny of paraneopteran insects., 英語
• 獣と寄生者の歩んできた道 : 対応, 共進化と宿主転換
  大舘 智志; 新井 智; 川北 篤; 吉澤 和徳; 倉持 利明; 横畑 泰志, 哺乳類科学, 53, 1, 181, 184, 2013年06月
  The Mammal Society of Japan, 日本語, 講演資料等（セミナー，チュートリアル，講習，講義他）
• 古い昆虫標本からのDNA抽出と抽出産物のPCR増幅
  大島 一正; 吉澤 和徳, 種生物学研究, 35, 0, 304, 311, 2012年03月31日
  日本語
• Problems in direct optimization
  Taxa, Proceedings of the Japanese Society of Systematic Zoology, 30, 17, 29, 2011年
• 極端に長い交尾器の挿入・引き抜きメカニズム
  松村 洋子; 吉澤 和徳, 形の科学会誌 = Bulletin of the Society for Science on Form, 24, 2, 131, 132, 2009年11月01日
  日本語
• 六脚類の高次分類体系と進化
  吉澤和徳, 節足動物の多様性と系統, 297, 329, 2008年
  裳華房
• H214 吸血性昆虫類の内部共生微生物 : その多様性と進化的起源
  深津 武馬; 古賀 隆一; 深津(佐々木; 佳世子; 二河 成男; 吉澤 和徳; 三原 實; 葛西 真治; 小林 睦生; 富田 隆史; Smith Wendy; Dale Colin; Clayton Dale, 日本応用動物昆虫学会大会講演要旨, 0, 51, 2007年03月01日
  日本応用動物昆虫学会, 日本語
• 北海道産ヒロバカゲロウ科に関する分類学的研究
  関本茂行; 吉澤和徳, 日本昆虫学会第64回大会講演要旨, 26, 2004年09月
  日本語, 研究発表ペーパー・要旨（全国大会，その他学術会議）
• タイワンリス(Callosciurus erythreaeus)から日本で初めて検出されたシラミNeo-haematopinus callosciuriの疫学様相(短報)(寄生虫病学)
  篠嵜 康雄; 吉沢 和徳; 村田 浩一; 椎橋 孝; 木村 順平; 丸山 総一; 葉山 嘉一; 吉田 博宣; 野上 貞雄, The journal of veterinary medical science, 66, 3, 333, 335, 2004年03月
  社団法人日本獣医学会, 英語, 書評論文,書評,文献紹介等
• Lienhard, C. & Smithers, C. N., 2002, 「Psocoptera (Insecta): World Catalogue and Bibliography」, Instrumenta Biodiversitatis 5, xli+745 pp., Museum d'histoire naturelle, Geneve, ISBN2-88139-009-9
  吉澤 和徳, 昆蟲. ニューシリーズ, 5, 4, 142, 142, 2002年12月25日
  日本昆虫学会, 日本語
• 17. 本虱は本当の虱か?(昆虫綱 : チャタテムシ目,シラミ科)(日本動物分類学会第37会大会講演抄録)
  吉澤 和徳; 小池 裕子, タクサ : 日本動物分類学会誌, 0, 11, 30, 30, 2001年08月20日
  日本動物分類学会, 日本語
• <国立科博専報>皇居の動物相調査で得られたチャタテムシ目昆虫
  吉澤 和徳, 国立科学博物館専報, 36, 0, 29, 34, 2000年
  This paper reports the following 23 psocopteran species collected through biological investigations of the Imperial Palace of Japan in 1998 and 1999; Trogiidae- Cerobasis guestfalica (Kolbe); Amphientomidae - Stimulopalpus japonicus Enderlein; Caeciliusidae - Paracaecilius japanus (Enderlein)， Valenzuela badiostigma (Enderlein), V.oyamai (Enderlein)， V. flavidus (Stephens)(new record from Japan)， V. scriptus (Enderlein); Stenopsocidae - Graphopsocus cruciatus (Linnaeus)， Stenopsocus aphidiformis Enderlein; Ectopsocidae - Ectopsocopsis cryptomeriae (Enderlein)，E ctopsocus sp.，E. briggsi McLa..., 国立科学博物館, 日本語
• チャタテムシの生物学(2)
  吉澤 和徳, インセクタリゥム, 36, 7, 202, 207, 1999年07月
  東京動物園協会, 日本語
• チャタテムシの生物学(1)
  吉澤 和徳, インセクタリゥム, 36, 6, 156, 161, 1999年06月
  東京動物園協会, 日本語
• Psocoptera of Bangladesh Collected by Prof. Emer. Katsura Morimoto, with Descriptions of Four New Species
  吉澤 和徳, Esakia : occasional papers of the Hikosan Biological Laboratory in Entomology, 37, 0, 15, 24, 1997年09月30日
  This paper reports on the following 8 psocopteran species collected by Prof. Emer. Katsura Morimoto from Bangladesh: Caecilius nigritibia sp. nov., Kodamaius directus sp. nov., Amphipsocus mangiferae sp. nov., Ectopsoucs pilosus Badonnel, E. triangulus Thornton & Wang. Calopsocus infelix (Hagen), Archipsocopsis fernandi (Pearman), and Pseudoscottiella morimotoi sp. nov., 九州大学, 英語
• H307 ムツテンチャタテ属Trichadenotecnum(チャタテムシ目:チャタテ科)に酷似するチャタテ科の1新属(分類学)
  吉澤 和徳, 日本応用動物昆虫学会大会講演要旨, 0, 40, 190, 190, 1996年03月15日
  日本応用動物昆虫学会, 日本語
• ロシア, ヤクート自治共和国(サハ共和国)におけるチャタテムシ6種の新記録(チャタテムシ目)
  吉澤 和徳; 安永 智秀; ビノクロフ ニコライ, 日本生物地理学会会報, 50, 1, 19, 22, 1995年11月20日
  英語
• B110 チャタテムシ目の翅基構造に関する研究(家屋害虫・有用昆虫・分類形態進化)
  吉澤 和徳, 日本応用動物昆虫学会大会講演要旨, 0, 39, 41, 41, 1995年08月25日
  日本応用動物昆虫学会, 日本語
• B103 日本産ムツテンチャタテ属Trichadenotecnumの分類学的再検討(チャタテムシ目:チャタテ科)(分類学)
  吉澤 和徳, 日本応用動物昆虫学会大会講演要旨, 0, 37, 34, 34, 1993年04月03日
  日本応用動物昆虫学会, 日本語

• イグノーベル賞受賞！ オスメス逆転昆虫トリカヘチャタテの研究 (時計台ブックレット)
  吉澤和徳
  札幌農学同窓会, 2026年04月10日, 4909281754, 44
• 節足動物の多様性と進化
  裳華房, 2008年

• 農学フロンティア総論, 2024年, 修士課程, 農学院
• 大学院共通授業科目（教育プログラム）：博物館学, 2024年, 修士課程, 大学院共通科目
• 多様性生物学研究法, 2024年, 修士課程, 理学院
• 昆虫系統進化学特論, 2024年, 修士課程, 農学院
• 生物生態・体系学特論Ⅰ, 2024年, 修士課程, 農学院
• 大学院共通授業科目（一般科目）：自然科学・応用科学, 2024年, 修士課程, 大学院共通科目
• 生物学概論, 2024年, 学士課程, 農学部
• 一般教育演習(ﾌﾚｯｼｭﾏﾝｾﾐﾅｰ), 2024年, 学士課程, 全学教育
• 環境と人間, 2024年, 学士課程, 全学教育
• 生物資源科学実験Ⅰ, 2024年, 学士課程, 農学部
• 生物学Ⅱ, 2024年, 学士課程, 全学教育
• 昆虫体系学, 2024年, 学士課程, 農学部
• 環境昆虫学概論, 2024年, 学士課程, 農学部

• 日本昆虫学会
• 日本進化学会

• 翅の獲得が昆虫にもたらした進化の制約とそこからの解放
  科学研究費助成事業
  2024年04月01日 - 2029年03月31日
  吉澤 和徳; 沓掛 展之
  日本学術振興会, 基盤研究(B), 北海道大学, 24K02080
• 見過ごされてきた生活史形質：異翅亜目昆虫における卵塊・卵形状と親の保護の相関進化
  科学研究費助成事業
  2021年04月 - 2025年03月
  工藤 慎一; 吉澤 和徳; 大庭 伸也
  キンカメムシ科とツノカメムシ科を用いた予備的な比較分析の結果，保護の進化に伴って卵のアスペクト比が高くなる相関進化が検出された。すなわち，保護を行う種は，保護を行わない種に比べて細長い卵を生産する。次に楕円フーリエ記述子に対して主成分分析を行った結果, 第１主成分（以下PC1）と第２主成分（PC2）で卵形状における分散の大部分を説明できることが明らかとなった（累積寄与率＝98.6％）。PC1とPC2を軸とする形態空間を構築したところ, 保護を行う種の凸包は, 保護を行わない種の凸包とは重ならなかった。つまり，アスペクト比解析で明らかになった細長い形状に加えて，卵の上部が鈍端な形であると解釈される領域に位置した。
  メス親が基質上に産み付けた卵塊を体で覆う姿勢で保護を行う種では，卵塊周辺部に対する捕食・寄生圧が高まることが明らかにされている（Eberhard 1975; Mappes & Kaitala 1994）。その結果，卵塊周辺部の卵に対する資源投資が減少し小型化する「卵サイズのクラッチ内変異」が生じていることが報告された（Mappes et al. 1997; Kudo 2001, 2006）。今年度得られた予備的な結果は，卵塊エリアを圧縮する方向に働く選択圧が，そのような卵サイズ変異だけでなく，卵形状の進化的変化にも関連していることを強く示唆している。すなわち，キンカメムシ科並びにツノカメムシ科において，メス親の防衛行動が細長い卵の進化を促したと考えられる。一方, 楕円フーリエ解析を用いた卵形状の定量化の結果, 保護を行う種の卵は上部がより鈍端な形であることが明らかとなったが，保護を行う種において, この卵の形状がどのような適応的意義をもつのか，現状では不明である。
  日本学術振興会, 基盤研究(C), 鳴門教育大学, 21K06335
• 半翅系昆虫の全形態学：ゲノム系統の検証と新奇形質の進化プロセス解明
  科学研究費助成事業 基盤研究(B)
  2019年04月01日 - 2024年03月31日
  吉澤 和徳; 山田 量崇; 塘 忠顕
  引き続きコロナの制限はあったが，過去に蓄積したサンプルと，国内数カ所でのサンプリングで得られた試料を基に研究を進めた．
  チャタテムシの頭部形態，胸部形態，交尾器形態のマイクロCTによる解析は順調に進んでおり，このうちいくつか（チャタテムシの胸部筋肉相，チャタテムシの雌交尾器の相同性）は延長期間中に投稿にまで至っている．また，チャタテムシの頭部構造に関しては，ドイツのイェナ大学との共同研究として今年度スタートした．ほかにも，半翅系昆虫全体の胸部形態の解析，シラミの微細構造の解析が進行中である．
  アメリカとの半翅系昆虫のゲノム解析プロジェクトも順調に進んでおり，チャタテムシの大規模ゲノム系統論文と，チャタテムシのミトコンドリアゲノム解析の論文が，延長期間中に投稿に至っている．
  出版に至った成果は，アフリカの特異的な形態を示すチャタテムシの系統学と形態学，多様性を遂げたチャタテムシの一群の分類学と交尾器形態，シラミの形態と分類，原始的なチャタテムシの化石の新種記載と形態解析が挙げられる．本研究課題の書くとなる成果ではないが，原始的な直翅系昆虫の系統解析，形態解析，生物地理解析の成果も出版した．直翅系昆虫は本研究課題の遂行にあたって外群として用いる群であり，この成果も最終的な解析に大きく影響してくる．
  複数の国際学会での発表も予定していたが，いずれも中止または延期となったため，期間中にこれらを行うことはできなかった．
  日本学術振興会, 基盤研究(B), 北海道大学, 19H03278
• 親の保護シンドロームの進化：ツノカメムシ類の系統種間比較による検討
  基盤研究(C)
  2016年04月 - 2019年03月
  工藤慎一
  親による子の保護と卵サイズやクラッチサイズなどの生活史形質の共進化は，古くから議論の続く問題である。メス親による子の保護が繰り返し進化した系統群であるツノカメムシ科を用いて，生活史形質間の進化的な関係を系統種間比較法により解析した。その結果，親の体サイズが繁殖投資に影響することが判明し，親の保護の進化は小卵・大クラッチの進化と相関するという，従来の理論の前提や予測に反する結果を得た。卵サイズとクラッチサイズにはトレードオフが認められたが，親の保護はこの関係に影響していなかった。形質の進化順序を検討したところ，卵サイズやクラッチサイズの変化が親による保護の進化に先んじて生じたと推定された。
  文部科学省, 基盤研究(C), 鳴門教育大学, 競争的資金, 16K07518
• “雌”交尾器のペニス化をもたらした進化的背景の解明
  科学研究費補助金（基盤B)
  2015年04月 - 2019年03月
  吉澤 和徳
  交尾中，精子を受け取るために雄に挿入される雌ペニスの進化は，Sensitibillini 族内で独立に2回 (トリカヘチャタテと Afrotrogla) 生じたと考えられる．このことは，雌ペニスの進化という極めて稀な進化事象を促進する要素が本族に存在することを示す．栄養豊富な精液をめぐるメス間競争，貧栄養的な生息環 境，精子貯蔵器官の切り替えバルブの3点が，雌ペニスの進化を促進する要因として考えられた.また，雌上位の交尾姿勢，コイル状の長い精子輸送ダクト，雌ペ ニス進化前に存在した雌の微小突起とそれを受け入れる雄の構造の3点により，雌ペニス進化の制約が弱まったことも重要な要素として考えられた
  文部科学省, 基盤研究(B), 北海道大学, 研究代表者, 競争的資金, 15H04409
• 第三紀周北極型分布を示すムツテンチャタテ属の大規模系統構築と生物地理解析
  科学研究費補助金(基盤研究(C))
  2012年04月 - 2016年03月
  吉澤 和徳
  東南アジア産のムツテンチャタテ属の分類学的研究を行い，９新種を期間中に記載した．また中国から記載されていた Cryptopsocus 属をムツテンチャタテ属のシノニムとした．
  ムツテンチャタテの系統解析により形態に基づいて推定された種群のほぼ全てが分子系統でも単系統と認められること，その一方でごく一部の種群において，交尾器形態の収斂や逆転現象が生じており，これにより誤った種群分類がなされていることを確認した．分岐年代推定，生物地理学的解析により，第三期にベーリング陸橋を通じた大陸間の移動分散，および寒冷期の分布の縮小が現在のムツテンチャタテの分布形成に大きく関与したことが明らかとなった．
  文部科学省, 基盤研究(C), 北海道大学, 研究代表者, 競争的資金, 24570093
• ツノカメムシ科の高次系統と繁殖戦略の進化
  科学研究費助成事業
  2013年04月 - 2015年03月
  吉澤 和徳; TSAI Jing-Fu
  親による子の保護行動の進化の要因の解明は，進化生物学で最も興味深いテーマの一つとなっている．本研究では母親による卵や子の保護行動の研究の進んでいる半翅目ツノカメムシ科ツノカメムシ亜科昆虫を対象に以下の研究を行った．１）ツノカメムシ亜科の分子系統関係の解明，２）卵保護行動の進化パターンの解明，３）卵保護行動の進化要因．
  １）核 18S rDNA, Histone 3，ミトコンドリア 12S rDNA, 16S rDNA, COI 遺伝子を用い，ツノカメムシ亜科44種の系統関係を推定した．外群にはツノカメムシ科の他の亜科の８種を用いた．解像度の高い系統仮説が得られ，Acanthosoma 属が非単系統群であることなど新たな知見も得られた．
  ２）１で得られた系統樹上に卵保護行動の有無を再構成した結果，保護行動が独立に少なくとも４回（亜科内３回，外群１回）進化していることが明らかとなった．亜科内での保護行動の単一起源の可能性は，尤度比検定により有意に却下された．
  ３）卵保護行動を行わない種で，腹部にある特殊な器官からの分泌物を卵に塗り付ける行動が確認された．また，この分泌器官は，卵保護行動を行う種では，消失または退化していることも明らかになった．分泌器官の有無を系統樹上に再構成し，卵保護行動の有無の再構成結果と比較したところ，卵保護の進化と分泌器官の退化／消失は常に同じ系統枝で起こっており，両形質の進化は系統的に有意に相関していることが明らかとなった．分泌器官が消失した種で，行動情報が得られていない種が多数存在するが，それらの種においてもらん保護行動が生じている可能性は高い．
  日本学術振興会, 特別研究員奨励費, 北海道大学, 13F03075
• アブラムシおよびその他昆虫における無性生殖種の進化的起源：交雑起源説の検証
  基盤研究 (B)
  2011年04月 - 2015年03月
  秋元信一
  エンドウヒゲナガアブラムシの無性生殖系統の起源に関してゲノムレベルの遺伝学研究を本年度も継続した。韓国で採集した個体について、核のelongation factor 1αの対立遺伝子をクローニングし、その配列を解析に加えた。解析の結果、交雑起源の無性生殖クローンが持つ２つの対立遺伝子のうち、一方の対立遺伝子と韓国の対立遺伝子が非常に近縁であることが明らかとなり、交雑個体の起源には大陸の集団が関与していることが示唆された。このことは、日本で繁殖している無性生殖クローンの起源はアジア大陸にあり、その起源がたいへんに古いことが示唆された。
  エンドウヒゲナガアブラムシの人為的交雑個体が産むオスについて詳細に調べたところ、いずれの掛け合わせでもオス生産時のX染色体の分離比がランダムであること、オスの翅形成には常染色体上の遺伝子がかかわっていること、さらに、X染色体がオス胚子の発育に関与していることが明らかになった。両方の戻し交雑クローン合計12系統について有性世代誘導実験を行った。その結果、いずれの系統も有性メスを産出し、オスについては全く産出できないものから正常なオスが 産まれるものまで、クローンによって異なった。卵子形成時には遺伝子の組み換えが起こるため、ハイブリッドの作る卵の染色体では組換えが起こっていると考えられるが、組換え自体は有性メス産生には影響がないと言える。
  シカハジラミの無性生殖の起源に関しては、新たに核遺伝子の７つの領域のプライマーを設計し、ミトコンドリアでの系統群間（Clade IaとClade IbとClade II）に変異があるかを調べた。しかし、2つの系統（Clade IとClade II）間の交雑の証拠は得られなかった。よって、シカハジラミの無性生殖では、交雑起源説は否定された。
  文部科学省, 基盤研究(B), 北海道大学, 競争的資金, 23370037
• シカ寄生性シラミ2種をモデル系とした形態進化に関する研究
  科学研究費補助金(若手研究(B))
  2009年04月 - 2012年03月
  吉澤 和徳
  ・北海道でフィールドワークを行い,シカ寄生性シラミのサンプリングを行った.あわせて,各地の自治体,狩猟組合などとコンタクトをとり,シカ毛皮の収集を行った.前年度のサンプリングとあわせ,北海道,本州,四国,九州,対馬,屋久島,口永良部島のシカとシラミの両サンプルを収集した.さらに海外の研究者の協力も得て,台湾のシカハジラミのサンプルと,外群となるニホンジカ以外のシカ寄生性のシラミを得ることができた.・前年度デザインしたCOIプライマーを用いて,シカとシカハジラミの系統関係を推定した.なお,シカとシカハジラミで完全に相同な領域を解析対象として選んだ.また,シカのサンプルは,実際にシラミが採集された個体となっていることから,ホスト-パラサイトの関係は完全に一対一で対応させることができた.解析の結果,シカは南北大きく二つのグループに分けられた.シカハジラミは大きく三つのグループに分けられた.シカとシカハジラミの系統関係は完全には一致しなかったが,統計的には有意な共進化関係が見られることが明らかとなった.また,シカハジラミの塩基置換速度は,シカのそれと比べ約6倍速いことも明らかとなった.これらの結果は,日本応用動物昆虫学会・日本昆虫学会共催支部大会において発表した.・本研究の過程で得られたデータの一部を用いて,シラミ目の高次系統関係の推定を行った.研究成果は,Molecular Phy...
  文部科学省, 若手研究(B), 北海道大学, 研究代表者, 競争的資金, 21770083
• 半翅系昆虫における特異的な分子進化のパターンとプロセスの解明
  科学研究費補助金(若手研究(B))
  2006年04月 - 2009年03月
  吉澤 和徳
  (1)シラミ,チャタテムシの詳細な高次系統関係を推定した(2)シラミとコナチャタテにおいて,塩基置換速度の加速,塩基含有量の変化,リボソームRNA二次構造の変化と言った特異的な進化現象が,互いに相関して起こっていることを明らかにした(3)シカハジラミのミトコンドリアゲノムが,複数の微小環から構成されていることを明らかにした(4)特異的な進化傾向によって,遺伝子情報のアライメントが困難となるが,このような領域の解析に広く使われている方法論である直接最適化法に重大な問題点が存在することを明らかにした(5)ジュズヒゲムシの特異的な分子進化傾向を明らかにするとともに,このことによって塩基配列データがこの昆虫の高次系統推定に当たって有用な情報をもたらさないことを明らかにした.
  文部科学省, 若手研究(B), 北海道大学, 研究代表者, 競争的資金, 18770058
• 半翅系昆虫の高次系統関係と穿孔―吸汁式口器の進化系列の解明
  科学研究費補助金(若手研究(B))
  2003年04月 - 2006年03月
  吉澤 和徳
  国内各地およびマレーシアにおいて,研究に用いる半翅系昆虫のサンプリングを行った.これらのフィールドワークにより,分子系統解析に必要なサンプルの収集はほぼ完了した.チャタテムシ目の頭部の形態学的研究を行い,頭盾および小顎において相同性の解釈の誤りを見いだした・これらの形質は,穿孔-吸汁式口器の進化のキーとなる形質であり,今後この研究結果に基づき,半翅目および総翅目の頭部の形態学的再検討を行う予定である.特に,小顎は半翅目+総翅目の単系統性を支持する形質でもあるため,発生過程も含めた綿密な調査を行う.分子系統解析に用いるDNAマーカーの探索を行った.ミトコンドリアの12S,16SrDNAと,核の18SrDNA, Histone3,Winglessが,進化速度が遅く,かつ幅広い分類群において比較的容易に増幅できる事から,高次系統関係の探索に有効なDNAマーカーの候補として挙げられた.これらの領域を増幅するためのPCRプライマーの設計は完了し,半翅系昆虫の幅広いサンプリングに基づく予備実験では,良好な結果が得られている.また,ミトコンドリア領域の塩基配列情報に基づき,チャタテムシ目及びシラミ目の分子系統解析を行った.この結果,チャタテムシ目が側系統群である事が明らかとなるとともに,シラミ目のミトコンドリアゲノムに,他の昆虫には見られない特異な進化傾向が見られる事も明らかとなった.現在...
  文部科学省, 若手研究(B), 北海道大学, 研究代表者, 競争的資金, 15770052
• 鳥類および哺乳類の外部寄生昆虫であるシラミ目の起源と系統進化に関する研究
  科学研究費補助金(奨励研究(A), 若手研究(B))
  2001年04月 - 2003年03月
  吉澤 和徳
  1.塩基配列情報に基づくチャタテムシおよびシラミの系統解析昨年度および本年度収集したDNA解析用の約50サンプルからDNAを抽出し,ミトコンドリアの12Sおよび16SrDNAをPCR法を用いて増幅し,これに基づき系統解析を行った.最節約法,近隣結合法,最尤法いずれの方法を用いても,シラミ目の姉妹群がチャタテムシ目コナチャタテ科である事を強く支持する結果が得られた.さらに,シラミとコナチャタテのミトコンドリアゲノムが,置換速度,二次構造,GC含有量において,他の昆虫のミトコンドリアには見られない特異な進化傾向を持つ事を明らかにした.これらの結果は,アメリカIllinois Natural History SurveyのKevin P. Johnson博士との共著論文としてMolecular Phylogenetics and Evolution誌に投稿中である.2.シラミの分類学的再検討日本産フクロウハジラミ属を,上記サンプルおよび九州大学から借用した内田コレクションに基づき分類学的に再検討した.その結果,多くの同定ミスと未記載種の存在を明らかにした.さらに,フクロウハジラミ属が,寄主-寄生者の関係において,多くのハジラミ類に見られるような一対一の関係が見られず,さらには亜科を越えるような非寄主特異性が存在する事を明らかにした.これらの結果は,宮城教育大学の溝田浩二氏と共同で,...
  文部科学省, 奨励研究(A), 若手研究(B), 北海道大学, 研究代表者, 競争的資金, 13740486
• 準新翅類(半翅系昆虫)の高次分類群の系統解析と形態進化系列の解明
  科学研究費助成事業 特別研究員奨励費
  1999年 - 2000年
  吉澤 和徳
  日本学術振興会, 特別研究員奨励費, 九州大学, 99J02978
• チャタテムシ目の系統分類学的研究
  科学研究費助成事業 特別研究員奨励費
  1998年 - 1998年
  吉澤 和徳
  日本学術振興会, 特別研究員奨励費, 九州大学, 96J00762