Researcher basic information

• Ph.D. in Agricultural Science, Hokkaido University, Jun. 2024
• Master of Agriculture, Ehime University, Mar. 2021
• Bachelor of Agriculture, Ehime University, Mar. 2019

• https://researchmap.jp/JuriyaOkayasu?lang=en

• https://orcid.org/0000-0002-6307-2939
• https://jglobal.jst.go.jp/detail?JGLOBAL_ID=202201008403174019
• https://www.researchgate.net/profile/Juriya-Okayasu

• 31022874

• https://orcid.org/0000-0002-6307-2939

• 202201008403174019

• systematics
• comparative biology
• Mutillidae

• Life Science, Biodiversity and systematics, Biogeography
• Life Science, Evolutionary biology, Evolutionary biology
• Life Science, Biodiversity and systematics, Phylogeny
• Life Science, Biodiversity and systematics, Taxonomy
• Life Science, Biodiversity and systematics, Systematics

Research activity information

• Apr. 2022, International Society of Hymenopterists, Student Presentation Prize
  Systematics, morphological phylogeny, and evolution of the male velvet ants of the tribe Smicromyrmini (Mutillidae) of East Asia
  Juriya Okayasu, International society
• Jul. 2017, Shikoku branch of the Entomological Society of Japan, Student presentation award
  Revision of the tribe Smicromyrmini Bischoff (Hymenoptera: Mutillidae) of Japan
  Juriya Okayasu

• Current knowledge on the velvet ants (Hymenoptera: Mutillidae, Myrmosidae) of Vietnam: faunal review and new distributional records
  Juriya Okayasu; Arkady S. Lelej; Kevin A. Williams; Craig M. Brabant; Lien Thi Phuong Nguyen; Anh Duc Nguyen; Thai Hong Pham; Tuong Thi Cat Truong
  Zootaxa, 5668, 1, 1, 104, Magnolia Press, 31 Jul. 2025, [Peer-reviewed], [Lead author, Corresponding author], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal, 48232636
• Discovery of the velvet ant genus Orientilla Lelej from Laos (Hymenoptera, Mutillidae, Dasylabrinae), with description of a related new species from India
  Juriya Okayasu
  Journal of Hymenoptera Research, 96, 817, 834, Pensoft Publishers Ltd., 17 Oct. 2023, [Peer-reviewed], [Lead author, Last author, Corresponding author], [International Magazine]
  English, Scientific journal, The genus Orientilla Lelej, 1979 is newly recorded from Laos based on O. tamaderai sp. nov. (Xieng Khouang) and O. vietnamica Lelej, 1979 (Vientiane). One additional new species, O. nitens sp. nov., is described from India (Tamil Nadu). These three species share many diagnostic features within Orientilla, but they are distinguished by the body coloration and shape of clypeus, hypostomal carina, humeral carina, and metasomal terga 1–2. An identification key to females of the genus is provided.
• Preliminary assessment of the velvet ant fauna in Nepal, with description of new species of the genera Strangulotilla Nonveiller and Zeugomutilla Chen
  Juriya Okayasu
  Insecta Matsumurana, 79, 1, 27, Oct. 2023, [Peer-reviewed], [Lead author, Last author, Corresponding author], [Domestic magazines]
  English, Scientific journal
• Love is in the air and beyond the ocean: Taxonomic review of Neotrogaspidia Lelej (Hymenoptera: Mutillidae: Trogaspidiini) in Northeast Asia highlights its unique distributional pattern
  Juriya Okayasu
  Entomological Science, 26, 1, e12532, Wiley, Mar. 2023, [Peer-reviewed], [Lead author, Last author, Corresponding author], [International Magazine]
  English, Scientific journal, The genus Neotrogaspidia Lelej, 1996 is a small group of velvet ants with five species from the Australasian, Oriental and Palearctic Regions. The type species, N. pustulata (Smith, 1873) (♂♀), is the only Northeast Asian species known at present. In this paper, N. elpinice (Mickel, 1933), stat. resurr. et comb. nov. (♂♀) is resurrected from the junior synonym of N. pustulata. Two new combinations are proposed for N. circumcincta (André, 1896), comb. nov. (♂♀) from Orientidia Lelej, 1996 and N. recticarinata (Chen, 1957), comb. nov. (♂) from Trogaspidia Ashmead, 1899. New synonymies are proposed for N. elpinice with T. aestivalis Hammer, 1949, syn. nov. and T. maritima Chen, 1957, syn. nov., and N. circumcincta with T. yuliensis Tsuneki, 1972, syn. nov. and Krombeinidia agricola Williams, 2019, syn. nov. An updated genus diagnosis and a key to all described species are provided. New records include N. circumcincta from Laos and Vietnam, N. pustulata from North Korea, and N. recticarinata from Taiwan. The inflated endophallus of the male genitalia of N. pustulata is illustrated. A potential host record, habitat records and mating observations of Neotrogaspidia are presented. The historical process of formation of the distributional patterns of this genus in Northeast Asia is discussed.
• Review of the tribe Mutillini (Hymenoptera: Mutillidae) from the Oriental Region
  Arkady S. Lelej; Kevin A. Williams; Joshua B. Terine; Juriya Okayasu; Grishma R. Parikh; Girish P. Kumar
  Zootaxa, 5228, 4, 455, 476, Magnolia Press, 16 Jan. 2023, [Peer-reviewed], ［Internationally co-authored］
  English, Scientific journal, The species in the tribe Mutillini (Mutillidae: Mutillinae) sensu Waldren et al. (2022, in press) of the Oriental region are reviewed. Fourteen species in the genera Kurzenkotilla Lelej, 2005, Mutilla Linnaeus, 1758, Standfussidia Lelej, 2005, and Storozhenkotilla Lelej, 2005 are keyed, reviewed, and illustrated. The males of the genus Kurzenkotilla are described and associated with the females. One new species: Storozhenkotilla nathani Lelej, sp. nov., male is described from India (Karnataka and Kerala). New combinations are proposed for Kurzenkotilla harmandi (André, 1898), comb. nov., K. rufodorsata (Cameron, 1897), comb. nov., K. semiviolacea (André, 1896), comb. nov., K. cicatricifera (André, 1894), comb. nov., and Storozhenkotilla binghami (Lelej, 2005), comb. nov. Six new country records are presented: Kurzenkotilla niveosignata (André, 1894) from Pakistan, K. annamensis Lelej, 2005 from Thailand, K. visrara (Cameron, 1898) from India, K. scrobiculata (Hammer, 1962) from Nepal, K. rufodorsata (Cameron, 1897) from Nepal, and Storozhenkotilla binghami Lelej, 2005 from Sri Lanka. Specimens of Mutilla mikado Cameron, 1900 from China were misidentified as Mutilla europaea by Su et al. (2019), and we recognize M. mikado as the sole member of the genus Mutilla to occur in the Oriental region. A key to the species of Oriental Mutillini is provided.
• Remarkable range extension of the genus Nordeniella Lelej, 2005 (Hymenoptera: Mutillidae: Smicromyrmini): Description of a new species from Sumbawa, Indonesia
  Juriya Okayasu
  Journal of Insect Biodiversity, 32, 2, 56, 63, Magnolia Press, 08 Jul. 2022, [Peer-reviewed], [Lead author, Last author, Corresponding author], [International Magazine]
  English, Scientific journal, The genus Nordeniella Lelej, 2005 had been known from India and Sri Lanka. Recently, this genus was discovered from Southern Thailand in 2019. A new species N. sumbawaensis Okayasu sp. nov. (♀) is described from Sumbawa, extending the geographical range of Nordeniella beyond Wallace Line. This new species is most similar to the Thai species N. maleeae Williams in Williams et al., 2019, but can be separated based on morphology. The occurrence of Nordeniella in an Indonesian island suggests wider distribution of this genus in the eastern Oriental Region.
• Review of female Andreimyrme Lelej (Hymenoptera: Mutillidae: Smicromyrmini)
  JURIYA OKAYASU; KEVIN A. WILLIAMS; ARKADY S. LELEJ; THAI HONG PHAM
  Zootaxa, 5061, 1, 1, 38, Magnolia Press, 03 Nov. 2021, [Peer-reviewed], [Lead author, Corresponding author], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal, Females of the East Asian velvet-ant genus Andreimyrme Lelej, 1995 are reviewed. The genus definition is extended to accommodate A. borkenti (Williams, 2019), comb. nov. (from Smicromyrme Thomson, 1870), and nine new species: A. auricoma Okayasu, sp. nov. (Malaysia), A. laminatihumeralis Okayasu, sp. nov. (Indonesia, Malaysia), A. matsumotoi Okayasu, sp. nov. (Vietnam), A. naturalis Williams, sp. nov. (Indonesia), A. rong Williams, sp. nov. (Thailand, Vietnam), A. silvorientalis Okayasu, sp. nov. (Indonesia), A. takensis Okayasu, sp. nov. (Thailand), A. ursasolaris Williams, sp. nov. (Indonesia), and A. yotoi Okayasu, sp. nov. (Laos, Vietnam). Diagnoses, distributional records, and illustrations are provided for these and four previously recognized species, A. neaera (Mickel, 1935), A. paniya Terine, Lelej & Girish Kumar, 2021, A. sarawakensis Lelej, 1996, and A. substriolata (Chen, 1957). Andreimyrme borkenti is newly recorded from Vietnam. A key to species known from females is provided. Habitat preference of this genus is discussed based on collecting records.
• A new velvet ant genus Arkaditilla (Hymenoptera, Mutillidae, Trogaspidiini) from the Oriental Region, with review of species
  Juriya Okayasu
  Journal of Hymenoptera Research, 84, 145, 168, Pensoft Publishers, 24 Aug. 2021, [Peer-reviewed], [Lead author, Last author, Corresponding author], [International Magazine]
  English, Scientific journal, A new Old World genus in the tribe Trogaspidiini Bischoff, 1920, Arkaditilla gen. nov., is described based on male morphology. Six species are recognized in this genus: A. bagrada (Cameron, 1902), comb. nov. (Indonesia, Malaysia), A. depressicornis (Mickel, 1935), comb. nov. (Malaysia), A. frim sp. nov. (Malaysia), A. gibba sp. nov. (Indonesia), A. leleji sp. nov. (Indonesia), and A. nallinia (Zavattari, 1914), comb. nov. (Indonesia). The species of this new genus were formerly placed in the genus Krombeinidia Lelej, 1996, but they are differentiated from it and other genera by having a unique set of morphological character states, such as the mandible inner margin expanded, forming subbasal tooth; the paramere antero-ventrally serrate; and the digitus dorsal margin lamellate. A key to species of Arkaditilla is provided.
• Review of Eotrogaspidia Lelej (Hymenoptera: Mutillidae: Trogaspidiini)
  JURIYA OKAYASU; ARKADY S. LELEJ; KEVIN A. WILLIAMS
  Zootaxa, 4920, 1, 56, 90, Magnolia Press, 27 Jan. 2021, [Peer-reviewed], [Lead author, Corresponding author], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal, Ten species of Eotrogaspidia Lelej, 1996, two related species of Trogaspidia Ashmead, 1899 and one related species of Vanhartenidia Lelej in Lelej & van Harten, 2006 are revised. Before this study, Eotrogaspidia included the following four species: E. amans (André, 1909) (♂♀), E. auroguttata (Smith, 1855) (♂♀), E. ekka (Nurse, 1902) (♀) and E. oryzae (Pagden, 1934) (♂♀). In the present paper, four new species are described: E. adhabar sp. nov. (♂) (India, Nepal), E. buddha sp. nov. (♂♀) (India, Nepal, Pakistan, Sri Lanka), E. hauseri sp. nov. (♂) (India, Nepal) and E. melanopleura sp. nov. (♀) (China). Three species are transferred to Eotrogaspidia from Trogaspidia: E. lena (Cameron, 1899), comb. nov. (♂), E. rubripes (André, 1901), comb. nov. (♀) and E. saussurei (Lelej, 2005), comb. nov. (♂♀). Mutilla ekka Nurse, 1902 from India is transferred from Eotrogaspidia to Vanhartenidia ekka, comb. nov. The male of E. saussurei is described. New synonymies are proposed for E. auroguttata (= T. vallicola Tsuneki, 1993, syn. nov.) and Trogaspidia mackieae (Cockerell, 1928) (= T. pacifica Tsuneki, 1972, syn. nov.). Eight new country records are presented: one from China, two from Laos, one from Vietnam, two from India, one from Iran, and one from Afghanistan. Female specimens of E. buddha sp. nov. were formerly misidentified as T. acidalia (Cameron, 1897), stat. resurr. by the late B. Petersen. The lectotype of T. acidalia is designated and illustrated to clarify its identity. Diagnoses and illustrations for reviewed species and a key to all known Eotrogaspidia species and related genera are provided for males and females.
• Discovery of an exotic grasshopper Atractomorpha sinensis sinensis Bolívar, 1905 from Shikoku, Japan through citizen science monitoring
  Juriya Okayasu
  Japanese Journal of Systematic Entomology, 26, 2, 371, 376, Japanese Society of Systematic Entomology, 30 Dec. 2020, [Peer-reviewed], [Lead author, Corresponding author], [Domestic magazines]
  English, Scientific journal
• Velvet ants of the tribe Smicromyrmini Bischoff (Hymenoptera: Mutillidae) of Japan
  Juriya Okayasu
  Zootaxa, 4723, 1, 1, 110, Magnolia Press, 20 Jan. 2020, [Peer-reviewed], [Lead author, Last author, Corresponding author], [International Magazine]
  English, Scientific journal, Japanese species and genera of the tribe Smicromyrmini Bischoff, 1920 are revised. Most of the relevant types were examined. The following eight species in the genera Smicromyrme Thomson, 1870, Nemka Lelej, 1985, Mickelomyrme Lelej, 1995, Andreimyrme Lelej, 1995, Ephucilla Lelej, 1995 and Sinotilla Lelej, 1995 are recognized from Japan: Sm. lewisi Mickel, 1935, ♂♀; N. yasumatsui (Mickel, 1936), stat. rev. et comb. nov., ♂♀; M. hageni (Zavattari, 1913), ♂♀; A. substriolata (Chen, 1957), ♀ (Amami-ôshima Is., Okinawa-jima Is.); E. yoshitakei sp. nov., ♂♀ (Amami-ôshima Is.), E. suginoi sp. nov., ♂♀ (Okinawa-jima Is.), E. brevitegula sp. nov., ♂♀ (Ishigaki-jima Is., Iriomote-jima Is.); Si. jambar sp. nov., ♂ (Okinawa-jima Is.). The genera Andreimyrme and Sinotilla are newly recorded from Japan. Nemka wotani (Zavattari, 1913) and Ephucilla naja (Zavattari, 1913) are excluded from the Japanese fauna. New synonymies are proposed for N. wotani (Zavattari, 1913) [=Smicromyrme chihpenchia Tsuneki, 1993, syn. nov.], N. limi limi (Chen, 1957) [=Smicromyrme limi nanhai Chen, 1957, syn. nov.], A. substriolata [=Smicromyrme tridentiens Chen, 1957, syn. nov.] and Neotrogaspidia pustulata (Smith, 1873) [=Smicromyrme yakushimensis Yasumatsu, 1934, syn. nov.]. Phimenes flavopictus formosanus (Zimmermann, 1931) (Hymenoptera: Vespidae: Eumeninae) is recorded as a host of Ephucilla brevitegula. Other new records include: Mickelomyrme athalia (Pagden, 1934) from China (Guangdong, Fujian, Yunnan) and Vietnam (Hoa Binh), M. bakeri (Mickel, 1934) from Malaysia (Borneo) and Indonesia (Sulawesi), M. pusillaeformis (Hammer, 1962) from Indonesia (Bali), Andreimyrme sarawakensis Lelej, 1996 from Peninsular Malaysia (Kuala Lumpur) and A. substriolata from Laos (Xiengkhouang, Houapanh), Thailand (Chiang Mai), Peninsular Malaysia (Kuala Terengganu) and Indonesia (Sumatra). Distributions of Japanese smicromyrmine species are classified into the following three patterns: Asian continental-Palaearctic Japan (Sm. lewisi and N. yasumatsui), Taiwan-Ryûkyû (M. hageni, E. yoshitakei, E. suginoi, E. brevitegula, Si. jambar) and Asian continental-Ryûkyû (A. substriolata). Species of Asian continental-Palaearctic Japan are widely distributed in Palaearctic part of Japan and eastern part of Eurasia, or have the closest relative in continental Asia. They are considered to be native to Japan since it was a part of Eurasia, or have immigrated to Japan through the land bridge between Korean Peninsula and Japan by the end of the Upper Pleistocene. The Taiwan-Ryûkyû species are immigrants from Taiwan through the land bridge. The Asian continental-Ryûkyû species is presumed to have immigrated to Japan during the Upper Pleistocene when the eastern edge of Eurasian Continent was close to Amami-ôshima Is.
• The female velvet ants (aka modkhong) of southern Thailand (Hymenoptera: Mutillidae), with a key to the genera of southeast Asia
  Kevin A. Williams; Arkady S. Lelej; Juriya Okayasu; Christopher J. Borkent; Rufeah Malee; Kodeeyah Thoawan; Narit Thaochan
  Zootaxa, 4602, 1, 1, 69, Magnolia Press, 07 May 2019, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal, A review of female mutillids in southern Thailand is presented, based on literature, loaned material, and two field expeditions. Thirty-three species in 23 genera have been previously recorded from Thailand (Lelej 2005; Lelej et al. 2016, 2017; Okayasu et al. 2018). In March and April 2017, 337 female specimens were collected in the provinces of Krabi, Nakhon Si Thammarat, Phatthalung, Songkhla, and Trang. In May 2018, 255 female specimens were collected in the provinces of Kanchanaburi, Phetchaburi, and Surat Thani. These collected specimens were sorted into 38 morphospecies: 13 already known from Thailand, nine previously described species newly recorded from Thailand, and 16 new to science and described here. Based on loaned material, three more described species were newly recorded from southern Thailand and one more undescribed species was found. Keys to females of the 31 mutillid genera found in southeast Asia and 42 mutillid species studied from southern Thailand are provided. Illustrations and diagnoses are provided for each species studied in southern Thailand, including the following 17 new species: Bischoffitilla tokay Williams, Bischoffitilla cambrai Williams, Mickelomyrme puttasoki Williams, Mickelomyrme kinguri Williams, Nordeniella maleeae Williams, Smicromyrme helarctos Williams, Smicromyrme borkenti Williams, Smicromyrme thaochani Williams, Krombeinidia agricola Williams, Krombeinidia chang Williams, Krombeinidia baanmaka Williams, Orientidia manleyi Williams, Orientidia thoawanae Williams, Petersenidia modkhong Williams, Petersenidia leleji Williams, Trogaspidia pittsi Williams, and Trogaspidia wilsoni Williams. Three new synonyms and one new combination are recognized: Bischoffitilla lamellata (Mickel, 1933) = Squamulotilla arundinacea Pagden, 1934, syn. nov., Mickelomyrme pusillaeformis (Hammer, 1962), comb. nov. = Mickelomyrme yunnanensis Lelej, 1996, syn. nov., Trogaspidia pagdeni (Mickel, 1933) = Timulla (Trogaspidia) pagdeni nodoa Mickel, 1933, syn. nov. Finally, two other taxa are raised to full species from subspecies status, Eotrogaspidia oryzae (Pagden, 1934), status resurr., and Trogaspidia lingnani (Mickel, 1933), status nov. New combination is also proposed for Krombeinidia meeungensis (Cockerell, 1928), comb. nov. Twenty-three new country records are presented: 12 from Thailand, four from Vietnam, four from Laos, two from Cambodia, and one from Indonesia.
• First record of Hylomesa akitsushimana Terayama & Mita, 2015 from Korean Peninsula (Hymenoptera: Tiphiidae: Myzininae)
  Juriya Okayasu
  Japanese Journal of Systematic Entomology, 24, 2, 283, 284, Japanese Society of Systematic Entomology, 30 Nov. 2018, [Peer-reviewed], [Lead author, Last author, Corresponding author], [Domestic magazines]
  English, Scientific journal
• Taxonomic review of Chin-wen Chen’s species described in the genus Smicromyrme (Hymenoptera: Mutillidae)
  Juriya Okayasu
  Acta Entomologica Musei Nationalis Pragae, 58, 2, 479, 494, National Museum, Czech Republic, 01 Oct. 2018, [Peer-reviewed], [Lead author, Last author, Corresponding author], [International Magazine]
  English, Scientific journal,
  Chin-wen Chen described 28 species and 10 subspecies of the velvet ant genus Smicromyrme Thomson, 1870 in his 1957 revision of the Mutillidae of China and Taiwan. Most of them were subsequently transferred to 12 genera of the tribes Smicromyrmini Bischoff, 1920 and Trogaspidiini Bischoff, 1920. Four species and one subspecies, however, are still included in Smicromyrme. In the present paper, type specimens of these species are surveyed. As a result, Sinotilla serpa columnata (Chen, 1957), comb. nov., stat. nov. (♂), Si. spinicauda (Chen, 1957), comb. nov. (♀), and Si. trisecta (Chen, 1957), comb. nov. (♂) are transferred from Smicromyrme. Smicromyrme bidenticulatus Chen, 1957 (♂♀) and Sm. triguttatus Mickel, 1933 (= Sm. triguttatus latisquamula Chen, 1957, syn. nov.) (♀) remain in Smicromyrme. Smicromyrme (Erimyrme) triguttatus is newly recorded from Vietnam and Laos, and Mickelomyrme kuznetsovi Lelej, 1996 is newly recorded from China.
• A remarkable new species of Sinotilla Lelej (Hymenoptera: Mutillidae: Smicromyrmini) from Taiwan and an overview of color diversity in East Asian mutillid females
  Juriya Okayasu; Kevin A. Williams; Arkady S. Lelej
  Zootaxa, 4446, 3, 301, 301, Magnolia Press, 18 Jul. 2018, [Peer-reviewed], [Lead author], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal, A remarkable new species, Sinotilla nigrothoracica sp. nov., is described and illustrated based on females from Taiwan. This new species is characteristic in having indistinct hypostomal teeth and a black mesosoma with the lateral margins strongly convergent posteriorly. An overview of female color patterns in the far-eastern Palaearctic and eastern Oriental regions is also presented.
• Two new species of the genus Sinotilla Lelej, 1995 (Hymenoptera: Mutillidae), with notes on taxonomic characters
  Juriya Okayasu
  Zootaxa, 4294, 2, 151, 151, Magnolia Press, 18 Jul. 2017, [Peer-reviewed], [Lead author, Last author, Corresponding author], [International Magazine]
  English, Scientific journal, Sinotilla calopoda sp. nov. (Indonesia, Jawa Barat) and S. ohbayashii sp. nov. (China, Fujian) are described and illustrated based on females. A key to species (females) of the genus Sinotilla is given. The importance of head shape for taxonomy is discussed.

• Exploring the final piece of Japanese mutillid fauna in Amami-Ôshima Island, the newest World Heritage site
  Juriya Okayasu, Hamuli, 12, 1, 25, 29, Dec. 2021, [Lead author], [International Magazine]
  International Society of Hymenopterists, Japanese, Introduction scientific journal
• First record of Hylomesa akitsushimana Terayama & Mita from Shikoku
  Juriya Okayasu, Gekkan-Mushi, 549, 59, 60, Nov. 2016, [Lead author]
• First record of Eotrogaspidia auroguttata (Smith) from Yaeyama Islands
  Juriya Okayasu, Gekkan-Mushi, 543, 61, 62, May 2016, [Lead author]
  Japanese

• 東アジアにおける森林性アリバチの多様性（膜翅目：アリバチ科）
  岡安樹璃也
  日本昆虫学会第85回大会, 15 Sep. 2025, Japanese, Oral presentation
  13 Sep. 2025 - 15 Sep. 2025
• ベトナムにおけるアリバチの多様性（膜翅目）
  岡安樹璃也
  2024年度北海道応用動物昆虫研究会, 23 Jan. 2025, Japanese, Oral presentation
  23 Jan. 2025 - 23 Jan. 2025
• Revision of forest-inhabiting velvet ant genera Orientidia Lelej and Promecidia Lelej (Hymenoptera: Mutillidae)
  Juriya Okayasu
  2023年度北海道応用動物昆虫研究会, 30 Jan. 2024, Japanese, Oral presentation
  30 Jan. 2024 - 30 Jan. 2024
• Introduction to mutillidology
  Juriya Okayasu
  日本昆虫学会第83回大会, 17 Sep. 2023, Japanese, Nominated symposium
  16 Sep. 2023 - 18 Sep. 2023
• フタオビアリバチ (膜翅目アリバチ科) の自然史
  岡安樹璃也
  2022年度北海道応用動物昆虫研究会, 16 Jan. 2023, Japanese, Oral presentation
  16 Jan. 2023 - 16 Jan. 2023, Japan, [Domestic Conference]
• 日本のアリバチ科: 起源と分類
  岡安樹璃也
  日本昆虫学会第82回大会, 04 Sep. 2022, 日本昆虫学会, Japanese, Oral presentation
  03 Sep. 2022 - 05 Sep. 2022, 長野県松本市, Japan, [Domestic Conference]
• Systematics, morphological phylogeny, and evolution of the male velvet ants of the tribe Smicromyrmini (Mutillidae) of East Asia
  Juriya Okayasu
  International Society of Hymenopterists #Hymathon2022 virtual symposium, 01 Apr. 2022, International Society of Hymenopterists, English, Oral presentation
  01 Apr. 2022, オンライン開催, [International presentation]
• アリバチ科 (膜翅目) の系統分類・多様性・生態
  岡安樹璃也
  2021年度北海道応用動物・昆虫研究会研究発表会, 20 Jan. 2022, 北海道応用動物・昆虫研究会, Japanese, Oral presentation
  20 Jan. 2022, オンライン開催, [Domestic Conference]
• Andreimyrme属・Ephucilla属・Sinotilla属 (膜翅目: アリバチ科) の属分類と雌雄の対応
  岡安樹璃也
  日本昆虫分類学会第24回大会, 04 Dec. 2021, 日本昆虫分類学会, Japanese, Oral presentation
  04 Dec. 2021 - 05 Dec. 2021, オンライン開催, [Domestic Conference]
• ハチ目アリバチ科の左右非対称な交尾器
  岡安樹璃也
  日本昆虫学会第81回大会, 05 Sep. 2021, 日本昆虫学会, Japanese, Poster presentation
  04 Sep. 2021 - 06 Sep. 2021, オンライン開催, [Domestic Conference]
• Systematics and host-parasitoid association of the Far Eastern velvet ants of the genus Nemka Lelej
  Juriya Okayasu
  International Society of Hymenopterists #Hymathon2021 virtual symposium, 07 May 2021, International Society of Hymenopterists, English, Oral presentation
  06 May 2021 - 07 May 2021, オンライン開催, [International presentation]
• 東アジア産アマリボシアリバチ族 (ハチ目: アリバチ科) のオス形態形質に基づく属レビューと系統解析
  岡安樹璃也
  第2回オンライン基礎昆虫学会議, 27 Feb. 2021, 昆虫分類学若手懇談会, Japanese, Oral presentation
  27 Feb. 2021, オンライン開催, [Domestic Conference]
• 極東のNemka属 (ハチ目アリバチ科)
  岡安樹璃也
  オンライン基礎昆虫学会議, 08 Aug. 2020, 昆虫分類学若手懇談会, Japanese, Oral presentation
  08 Aug. 2020, オンライン開催, [Domestic Conference]
• コブラアリバチ種群 (ハチ目: アリバチ科) の分布はどのように形成されたか
  岡安樹璃也
  日本昆虫学会第79回大会, 15 Sep. 2019, 日本昆虫学会, Japanese, Poster presentation
  14 Sep. 2019 - 16 Sep. 2019, 青森県弘前市, Japan, [Domestic Conference]
• クマバチ属 Xylocopa Latreilleの新亜属新種 (ハチ目: ミツバチ科)
  岡安樹璃也
  四国昆虫研究会第2回大会, 06 Jul. 2019, 四国昆虫研究会, Japanese, Oral presentation
  06 Jul. 2019, 愛媛県西条市, Japan, [Domestic Conference]
• Andreimyrme属の再検討 (ハチ目: アリバチ科): メス編
  岡安樹璃也
  日本昆虫分類学会第21回大会, 15 Dec. 2018, 日本昆虫分類学会, Japanese, Oral presentation
  15 Dec. 2018, 愛媛県松山市, Japan, [Domestic Conference]
• Ephucilla属とSinotilla属の属分類 (ハチ目: アリバチ科)
  岡安樹璃也
  日本昆虫学会第78回大会, Sep. 2018, 日本昆虫学会, Japanese, Oral presentation
  07 Sep. 2018 - 10 Sep. 2018, 愛知県名古屋市, Japan, [Domestic Conference]
• Revision of the tribe Smicromyrmini of Japan
  Juriya Okayasu
  International Society of Hymenopterists 9th meeting, 26 Jul. 2018, International Society of Hymenopterists, English, Poster presentation
  23 Jul. 2018 - 27 Jul. 2018, Matsuyama, Ehime, Japan, [International presentation]
• アリバチ科 (ハチ目) の東アジアおよび旧北区東部におけるミュラー型擬態群
  岡安樹璃也
  四国昆虫研究会第1回大会, 16 Jun. 2018, 四国昆虫研究会, Japanese, Oral presentation
  16 Jun. 2018, 香川県坂出市, [Domestic Conference]
• Chin-wen Chen博士によって記載されたSmicromyrme属のアリバチ科 (ハチ目)
  岡安樹璃也
  日本昆虫分類学会第20回大会, 09 Dec. 2017, 日本昆虫分類学会, Japanese, Oral presentation
  09 Dec. 2017, 福岡県北九州市, Japan, [Domestic Conference]
• トウヨウアリバチ属およびヤクシマアリバチ属 (アリバチ科) を定義する雌の形質
  岡安樹璃也; 小西和彦
  日本昆虫学会第77回大会, 03 Sep. 2017, 日本昆虫学会, Japanese, Oral presentation
  02 Sep. 2017 - 04 Sep. 2017, 愛媛県松山市, Japan, [Domestic Conference]
• 日本産アマリボシアリバチ族 (ハチ目アリバチ科) の再検討
  岡安樹璃也
  日本昆虫学会四国支部会第56回大会, 22 Jun. 2017, 日本昆虫学会四国支部, Japanese, Oral presentation
  22 Jun. 2017, 徳島県つるぎ町, Japan, [Domestic Conference]
• ヤクシマアリバチ属の2新種と♀頭部形態の属内変異
  岡安樹璃也
  日本昆虫分類学会第19回大会, 10 Dec. 2016, 日本昆虫分類学会, Japanese, Oral presentation
  10 Dec. 2016, 愛媛県松山市, Japan, [Domestic Conference]
• 愛媛大学ミュージアム所蔵の日本産アリバチ科標本 (ハチ目)
  岡安樹璃也
  日本昆虫学会四国支部会第55回大会, 30 Jul. 2016, 日本昆虫学会四国支部, Japanese, Oral presentation
  30 Jul. 2016, 高知県香美市, Japan, [Domestic Conference]

• 2017 - Present
  International Society of Hymenopterists
• 2017 - Present
  The Entomological Society of Japan

• Rethinking resource competition: Phylogenetic systematic, ecological, and biogeographical approach based on non-model organisms
  Grants-in-Aid for Scientific Research
  25 Apr. 2023 - 31 Mar. 2025
  岡安 樹璃也
  Japan Society for the Promotion of Science, Grant-in-Aid for JSPS Fellows, Hokkaido University, 23KJ0038
• アリバチ科を用いた東アジア地域の生物地理学的研究
  次世代研究者挑戦的研究プログラム/
  Apr. 2021 - Mar. 2023
  科学技術振興機構, 北海道大学農学院, Principal investigator

• 昆虫教室
  Apr. 2015 - Mar. 2021
  Lecturer
  JMACS
• Parasitoid wasps
  Sep. 2019
  Lecturer
  Saijo Nature School
  夜の学校
• えひめこどもの城昆虫教室
  Apr. 2015 - Mar. 2019
  Lecturer
  自然環境教育えことのは