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Iba Yasuhiro

Faculty of Science　Earth and Planetary Sciences　Earth and Planetary System ScienceAssociate Professor

Paleontologist

Senior Lecturer
Hokkaido University of Education,
1-15-55, Shiroyama, Kushiro, Hokkaido, 085-8580, Japan
Phone & Fax: +81-154-44-3398

http://ibayasuhrio.com

2008 Ph.D.: Department of Earth and Planetary Science, the University of Tokyo, Tokyo

Researcher basic information

■ Degree
  • Ph.D., The University of Tokyo
■ URL
researchmap URLホームページURL■ Various IDs
Researcher number
  • 80610451
J-Global ID■ Research Keywords and Fields
Research Keyword
  • トモグラフィ技術
  • レンダリング技術
  • 地球生命史
  • Astropaleobiology
  • Biodiversity
  • Paleobiology
  • Biostratigraphy
  • bioimaging
  • History of Life
Research Field
  • Life Science, Neuroscience-general, 脳イメージング
  • Life Science, Morphology and anatomical structure, バイオイメージング，トモグラフィ技術，レンダリング
  • Natural Science, Space and planetary sciences, 宇宙生物学，惑星探査技術
  • Natural Science, Biogeosciences, バイオイメージング，画像解析，生命進化
■ Educational Organization

Career

■ Career
Career
  • Apr. 2017 - Present
    Hokkaido University, Department of Earth and Planetary Sciences, Associate Professor
  • Oct. 2012 - Mar. 2017
    Department of Natural History Sciences, Hokkaido University, Assistant Professor
  • Apr. 2011 - Sep. 2012
    Hokkaido University of Education, Lecturer
  • Feb. 2011 - Mar. 2011
    Ruhr Universitaet Bochum, Germany, Visiting Researcher
  • Apr. 2010 - Mar. 2011
    Nihon University, Lecturer (non-full time)
  • Apr. 2009 - Mar. 2011
    Department of Geology and Paleontology, National Museum of Nature and Science, Tokyo, JSPS Research Fellow
  • Apr. 2008 - Sep. 2010
    Department of Mathematics and Science, Kokushikan University, Lecturer (non-full time)
  • Jan. 2010 - Jun. 2010
    Ruhr-Universitaet Bochum, Germany, Visiting Researcher
  • Apr. 2008 - Mar. 2009
    Department of Earth and Planetary Science, The University of Tokyo, Research Fellow
  • Apr. 2006 - Mar. 2008
    Department of Earth and Planetary Science, The University of Tokyo, JSPS Research Fellow (DC2)
  • Apr. 2005 - Mar. 2006
    Department of Earth and Planetary Science, The University of Tokyo, Research Assistant: The 21st Century Earth Science COE Program
Educational Background
  • Apr. 2005 - Mar. 2008, 東京大学大学院, 理学系研究科, 地球惑星科学専攻 博士過程

Research activity information

■ Awards
  • Jul. 2021, Paleontological Society of Japan, Academic Prize, Paleontological Society of Japan
  • 2017, 公益法人 北海道科学技術総合振興センター, 理事長賞
    伊庭靖弘
  • 2010, Japan Society for Promotion of Science, JSPS Excellent Young Researcher Overseas Visit Program
    Yasuhiro Iba
  • 2009, Paleontological Society of Japan, Best Poster Award
    Yasuhiro Iba
  • 2009, Inoue Foundation for Science, Tokyo, Inoue Research Award for Young Scientists
    Yasuhiro Iba
  • 2009, Paleontological Society of Japan, Poster Award
    Yasuhiro Iba
  • 2009, Inoue Foundation for Science, Inoue Research Award for Young Scientists
    Yasuhiro Iba
  • Mar. 2008, The University of Tokyo, Graduate School of Science Award (Ph.D.)
    Yasuhiro Iba
■ Papers
  • Earliest octopuses were giant top predators in Cretaceous oceans
    Yasuhiro Iba; Shin Ikegami; Yusuke Takeda; Joerg Mutterlose; Kazuki Tainaka; Kanta Sugiura; Mehmet Oguz Derin; Aya Kubota; Takahiro Harada; Harufumi Nishida
    Science, 23 Apr. 2026
    Scientific journal
  • A new amber Lagerstätte from the Lower Cretaceous of Japan
    Aya Kubota; Ryo Taniguchi; Yoshinori Hikida; Yasuhiro Iba
    Cretaceous Research, in press, 106236, Feb. 2026, [Peer-reviewed], [Last author], [International Magazine]
    English, Scientific journal, 44573255;45268692;45130347;45160777
  • The oldest sepioid cephalopod from the Cretaceous discovered by Digital fossil-mining with zero-shot learning AI
    Kanta Sugiura; Shin Ikegami; Yusuke Takeda; Jörg Mutterlose; Mehmet Oguz Derin; Aya Kubota; Harufumi Nishida; Kazuki Tainaka; Takahiro Harada; Neil H. Landman; Yasuhiro Iba
    Communications Biology, Springer Science and Business Media LLC, 16 Jan. 2026
    Scientific journal, Abstract

    Sepioids are an evolutionarily successful group of modern ten-armed cephalopods (Decabrachia) of high biodiversity, providing a large amount of biomass in present-day oceans. They include the internally shelled order Sepiida (cuttlefish) and the soft-bodied order Sepiolida (bobtail squid). The phylogenetic position and evolutionary history of these orders are, however, so far poorly understood due to the patchy fossil record of the Decabrachia. Here we report Uluciala rotundata gen. et sp. nov. from the upper Campanian to upper Maastrichtian (~74–67 Ma, Upper Cretaceous), South Dakota, which shows an intermediate morphology between Sepiida and Sepiolida. This discovery was facilitated by a new approach in palaeontology, the Digital fossil-mining method incorporating a zero-shot learning AI model. Uluciala rotundata demonstrates a close relationship between the two sepioid orders, which has previously been interpreted controversially. Our findings indicate that sepioids experienced an early phase of radiation in the later part of the Late Cretaceous.
  • The bright-field grinding tomography of coarse-grained calcium‑aluminum-rich inclusions in the Allende meteorite
    Ryota Fukai; Yusuke Takeda; Yuki Masuda; Daiki Yamamoto; Yasuhiro Iba; Shintaro Sasaki; Shin Ikegami; Aya Kubota; Reo Sato; Tomohiro Usui
    Icarus, 439, 116648, 116648, Elsevier BV, Oct. 2025, [Peer-reviewed], [Last author], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal, 44573255;44555961;45160777
  • Modern silica sinter deposits from an island-arc setting and their potential for fossilizing plants
    Aya Kubota; Ryo Taniguchi; Tomoyuki Ueda; Yasuhiro Iba
    Palaeogeography, Palaeoclimatology, Palaeoecology, 113176, 113176, Elsevier BV, Aug. 2025, [Peer-reviewed], [Last author, Corresponding author], [International Magazine]
    English, Scientific journal, 44573255;45130347;45160777
  • Origin and radiation of squids revealed by digital fossil-mining
    Shin Ikegami; Yusuke Takeda; Jörg Mutterlose; Yasuhiro Iba
    Science, 388, 6754, 1406, 1409, American Association for the Advancement of Science (AAAS), 26 Jun. 2025, [Peer-reviewed], [Last author, Corresponding author], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal, The evolution of soft-bodied squids, which provide a major part of the biomass in modern oceans globally, is poorly understood owing to their patchy fossil record. We provide a comprehensive evolutionary history of squids through “digital fossil-mining” techniques, revealing a new lagerstätte. The more than 250 fossil beaks of 40 species show that squids originated and rapidly radiated by 100 million years ago. Our data suggest that the radical shift from heavily shelled, slowly moving cephalopods to soft-bodied forms did not result from the end-Cretaceous mass extinction (66 million years ago). Early squids had already formed large populations, and their biomass exceeded that of ammonites and fishes. They pioneered the modern-type marine ecosystem as intelligent, fast swimmers., 44573255;45130347;45160777
  • Amber in the Cretaceous deep sea deposits reveals large-scale tsunamis
    Aya Kubota; Yusuke Takeda; Keewook Yi; Shin-ichi Sano; Yasuhiro Iba
    Scientific Reports, 15, 1, Springer Science and Business Media LLC, 15 May 2025, [Peer-reviewed], [Last author], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal, 44573255;45130347;45160777
  • Nature visible only digitally
    Yasuhiro Iba; Aya Kubota; Yusuke Takeda; Mehmet Oguz Derin; Shin Ikegami; Jörg Mutterlose; Takahiro Harada; Tomonori Takeuchi; Kazuki Tainaka
    Patterns, 6, 4, 101210, 101210, Elsevier BV, Apr. 2025, [Peer-reviewed], [Lead author, Corresponding author], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal
  • Reconstruction of the ancient binocular vision: advanced stereopsis and predatory adaptation in a Cretaceous mantis
    Ryo Taniguchi; Yuki Fukuda; Kanta Sugiura; Yasuhiro Iba
    Acta Palaeontologica Polonica, 70, Polska Akademia Nauk Instytut Paleobiologii (Institute of Paleobiology, Polish Academy of Sciences), 2025, [Peer-reviewed], [Last author], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal, 44573255;45130347
  • Sensory evidence for complex communication and advanced sociality in early ants
    Ryo Taniguchi; David A. Grimaldi; Hidehiro Watanabe; Yasuhiro Iba
    Science Advances, 10, 24, 14 Jun. 2024, [Peer-reviewed], [Last author], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal, 44573255;45130347;45160777
  • Three‐dimensional reconstruction of the in situ mode of life of the Cambrian coral Cambroctoconus: asexual reproduction and colony growth in immediate response to cryptic habitats
    Yoichi Ezaki; Mei Kishida; Yusuke Takeda; Natsuko Adachi; Jianbo Liu; Yasuhiro Iba
    Papers in Palaeontology, 9, e1497, May 2023, [Peer-reviewed], [Last author], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal, AbstractThe Cambrian cnidarian Cambroctoconus orientalis occurs in clusters exhibiting pendent growth in crypts within thrombolite frameworks. Here we successfully reconstruct its three‐dimensional (3D) in situ mode of life. The 3D reconstruction shows the initial individuals of colonies and attachment structures, budding sites and growth modes of coralla in response to the extent of sheltered spaces. The earliest individuals were attached to the framework by a suction‐cup‐like structure and were basically orthogonal to the walls, growing downward. Their calicular bases were pierced by a hole. Individuals were initially cylindrical and gradually formed an octagonal column during growth. Budding occurred everywhere, and toroidal budding traces are abundant upon the corallite surfaces. The attachment structures were secondarily reinforced by continuous secretion from the coenenchymal tissue. Offsets continued to grow only when sufficient growth space was available, while producing as many individuals as possible. Growth of individuals was commonly halted by the surrounding framework. Growth directions were in part modified by corallite curvature to avoid collisions between corallites and to make full use of the intricate void spaces. In deteriorating conditions, offset corallites appeared through regeneration rather than budding from the remaining soft tissues. Active exploitation of the sheltered spaces within thrombolites, which remained dominant during the Cambrian, was thus conducted by C. orientalis. Notably, the cryptobionts treated herein adopted subtle growth strategies that have not previously been fully understood and are not easily interpreted with reference to organisms living in open spaces., 45130347;45160777
  • Compression and Interactive Visualization of Terabyte Scale Volumetric RGBA Data with Voxel-scale Details
    Mehmet Oguz Derin; Takahiro Harada; Yusuke Takeda; Yasuhiro Iba
    ACM SIGGRAPH 2022, ACM, 27 Jul. 2022, [Peer-reviewed], [Last author], ［Internationally co-authored］, [International Magazine]
    English, International conference proceedings, 45160777
  • Reconstructing the ecology of a Cretaceous cockroach: destructive and high-resolution imaging of its micro sensory organs
    Ryo Taniguchi; Hiroshi Nishino; Hidehiro Watanabe; Shûhei Yamamoto; Yasuhiro Iba
    The Science of Nature, 108, 5, Springer Science and Business Media LLC, Oct. 2021, [Peer-reviewed], [Last author], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal, 45160777
  • Sparse Volume Rendering using Hardware Ray Tracing and Block
    Mehmet Oguz Derin; Takahiro Harada; Yusuke Takeda; Yasuhiro Iba
    SIGGRAPH Asia 2021 Technical Communications, ACM, 2021, [Peer-reviewed], [Last author], ［Internationally co-authored］, [International Magazine]
    English, International conference proceedings, 45160777
  • Palaeobiogeography and palaeoecology of Early Cretaceous belemnites from the northern high latitudes
    Jörg Mutterlose; Peter Alsen; Yasuhiro Iba; Simon Schneider
    Proceedings of the Geologists' Association, 131, 3-4, 278, 276, Aug. 2020, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal, 45160777;45392003
  • The Muensterelloidea: phylogeny and character evolution of Mesozoic stem octopods
    Dirk Fuchs; Yasuhiro Iba; Alexander Heyng; Masaya Iijima; Christian Klug; Neal L. Larson; Günter Schweigert
    Papers in Palaeontology, 6, 1, 31, 92, Feb. 2020, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal, AbstractThe Muensterelloidea is a superfamily of teudopseid octobrachians with a posteriorly patella‐shaped gladius. A morphometric comparison based on 148 muensterelloid gladii has yielded five new species accommodated in three new genera:Engeseriteuthis arcuatusgen. et sp. nov.,Muensterella jillaesp. nov.,Muensterella spinosasp. nov.,Tyrionella fauserigen. et sp. nov. andMuensterellina johnjagtigen. et sp. nov. Cretaceous taxa ‘Tusoteuthis’cobbaniand ‘Muensterella’toniiare re‐combined and placed within the genusEnchoteuthis. We introduce categories for gladius proportions applicable for both muensterelloid and non‐muensterelloid octobrachian gladii. A 2D‐landmark analysis including 64 muensterelloid and non‐muensterelloid gladii statistically confirms that the Muensterelloidea possess the smallest median field sizes of all Mesozoic gladii. We consider the lateral field‐dominated ‘gladius’ of the family Patelloctopodidae (Patelloctopus,Pearceiteuthis) to be vestigial (i.e. shorter than the mantle length) suggesting that the Patelloctopodidae are the last shared ancestors of incirrate and cirrate octopods. According to a phylogenetic analysis based on 31 gladius characters, the Muensterelloidea mainly consists of the ‘Muensterella‐Enchoteuthidae’ and the ‘patelloctopodid’ clade. Ancestral character state reconstructions suggest that an increasing posterior growth front is accompanied by a continuous decrease of the median field length. This milestone in the evolution of the octopod gladius vestige occurred between the Early and Middle Jurassic. The benthic life style of incirrate octopods (including Cretaceous palaeoctopodids) was adopted by Jurassic Patelloctopodidae, which arose from nectonic to nectobenthic teudopseid ancestors. There is currently no evidence to suggest a pelagic origin for benthic octopods., 45160777;45039215;45392003
  • Family Nipponoteuthididae
    Iba, Y
    In Treatise on Invertebrate Paleontology Part M, Mollusca 5: Coleoidea. Geological Society of America and the University of Kansas Press, Lawrence, inpress, 2018, [Peer-reviewed], [Invited], [Lead author], [International Magazine]
    English, Scientific journal
  • Family Sinobelemnitididae
    Iba, Y
    In Treatise on Invertebrate Paleontology Part M, Mollusca 5: Coleoidea. Geological Society of America and the University of Kansas Press, Lawrence, 2018, [Peer-reviewed], [Invited], [Lead author], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal
  • Past emergent phase of Shatsky Rise deep-marine igneous plateau
    Moriaki Yasuhara; Atsushi Ando; Yasuhiro Iba
    SCIENTIFIC REPORTS, 7, 15423, Nov. 2017, [Peer-reviewed], [Last author], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal

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  • Belemnite biomineralization, development, and geochemistry: The complex rostrum of Neohibolites minimus
    Kevin Stevens; Erika Griesshaber; Wolfgang Schmahl; Laura A. Casella; Yasuhiro Iba; Joerg Mutterlose
    PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, 468, 388, 402, Feb. 2017, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal
  • The first coleoid cephalopods from the Upper Cenomanian of Sicily (Italy) and their implications for the systematic-phylogenetic position of the Palaeololiginidae (Teudopseina)
    Dirk Fuchs; Agatino Reitano; Gianni Insacco; Yasuhiro Iba
    JOURNAL OF SYSTEMATIC PALAEONTOLOGY, 15, 6, 499, 512, 2017, [Peer-reviewed], [Last author], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal
  • The locomotion system of Mesozoic Coleoidea (Cephalopoda) and its phylogenetic significance
    Dirk Fuchs; Yasuhiro Iba; Helmut Tischlinger; Helmut Keupp; Christian Klug
    LETHAIA, 49, 4, 433, 454, Oct. 2016, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal
  • A nearly complete respiratory, circulatory, and excretory system preserved in small Late Cretaceous octopods (Cephalopoda) from Lebanon
    Dirk Fuchs; Philipp R. Wilby; Sigurd von Boletzky; Pierre Abi-Saad; Helmut Keupp; Yasuhiro Iba
    PALAEONTOLOGISCHE ZEITSCHRIFT, 90, 2, 299, 305, Jun. 2016, [Peer-reviewed], [Last author], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal
  • Mid-Cretaceous rudists (Bivalvia: Hippuritida) from the Langshan Formation, Lhasa block, Tibet
    Xin Rao; Peter W. Skelton; Jingeng Sha; Huawei Cai; Yasuhiro Iba
    Papers in Palaeontology, 1, 4, 401, 424, 01 Nov. 2015, [Peer-reviewed], [Last author], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal
  • The gladiuses in coleoid cephalopods: homology, parallelism, or convergence?
    Dirk Fuchs; Yasuhiro Iba
    Swiss Journal of Palaeontology, 134, 2, 187, 197, Nov. 2015, [Peer-reviewed], [Last author], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal
  • Biological and environmental signals recorded in shells of Argonauta argo (Cephalopoda, Octobrachia) from the Sea of Japan
    Kevin Stevens; Yasuhiro Iba; Akihiko Suzuki; Joerg Mutterlose
    MARINE BIOLOGY, 162, 11, 2203, 2215, Nov. 2015, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal
  • Early Jurassic belemnites from the Gondwana margin of the Southern Hemisphere -Sinemurian record from South Tibet
    Yasuhiro Iba; Shin-ichi Sano; Xin Rao; Dirk Fuchs; Tingen Chen; Robert Weis; Jingeng Sha
    GONDWANA RESEARCH, 28, 2, 882, 887, Sep. 2015, [Peer-reviewed], [Lead author, Corresponding author], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal
  • Preliminary report of earliest Cretaceous belemnites from Japan and their paleobiogeographic significance
    Sano Shin-ichi; Iba Yasuhiro; Isaji Shinji; Asai Hidehiko; Dzyuba Oksana S.
    Jour. Geol. Soc. Japan, 121, 2, 71, 79, The Geological Society of Japan, 2015, [Peer-reviewed], ［Internationally co-authored］, [Domestic magazines]
    Japanese, We report on the first known occurrences of earliest Cretaceous belemnites in Japan, including: Cylindroteuthis aff. knoxvillensis Anderson (Cylindroteuthididae) from the Mitarai Formation (Berriasian) of the Tetori Group in the Shokawa area, Gifu Prefecture, central Japan; and Hibolithes spp. (Mesohibolitidae) from the Isokusa Formation (Berriasian-Valanginian) in the Kesennuma area, Miyagi Prefecture, and the Koyamada Formation (Berriasian-Valanginian) of the Somanakamura Group in the Minamisoma area, Fukushima Prefecture, both in the South Kitakami region, northeastern Japan. According to belemnite biogeography, Cylindroteuthis is considered a typical Boreal genus and Hibolithes a typical Tethyan genus. The recognition of Tethyan faunal elements in the South Kitakami region, which is presently located farther north than the Tetori region, and Boreal faunal elements in the Tetori region, contributes to the reconstruction of earliest Cretaceous paleogeography and oceanic current systems in the northwestern Pacific during this time. As the ammonoid assemblages of the Mitarai, Isokusa, and Koyamada formations are characterized by dominant Tethyan and Pacific genera and the absence of Boreal elements, it appears that Boreal and Tethyan faunas co-occurred in the paleo-Tetori region in the earliest Cretaceous.
  • Large belemnites were already common in the Early Jurassic-new evidence from Central Japan
    Yasuhiro Iba; Shin-Ichi Sano; Michiharu Goto
    PALEONTOLOGICAL RESEARCH, 19, 1, 21, 25, Jan. 2015, [Peer-reviewed], [Lead author, Corresponding author], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal
  • THE EVOLUTION OF CANALICULATE RUDISTS IN THE LIGHT OF A NEW CANALICULATE POLYCONITID RUDIST FROM THE ALBIAN OF THE CENTRAL PACIFIC
    Shin-ichi Sano; Yasuhiro Iba; Peter W. Skelton; Jean-Pierre Masse; Yolanda M. Aguilar; Tomoki Kase
    PALAEONTOLOGY, 57, 5, 951, 962, Sep. 2014, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal
  • The Early Evolutionary History of Belemnites: New Data from Japan
    Yasuhiro Iba; Shin-ichi Sano; Joerg Mutterlose
    PLOS ONE, 9, 5, May 2014, [Peer-reviewed], [Lead author, Corresponding author], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal
  • LONGIBELUS GEN. NOV., A NEW CRETACEOUS COLEOID GENUS LINKING BELEMNOIDEA AND EARLY DECABRACHIA
    Dirk Fuchs; Yasuhiro Iba; Christina Ifrim; Tomohiro Nishimura; William J. Kennedy; Helmut Keupp; Wolgang Stinnesbeck; Kazushige Tanabe
    PALAEONTOLOGY, 56, 5, 1081, 1106, Sep. 2013, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal
  • Worldwide distribution of the modiomorphid bivalve genus Caspiconcha in late Mesozoic hydrocarbon seeps
    Robert G. Jenkins; Andrzej Kaim; Crispin T. S. Little; Yasuhiro Iba; Kazushige Tanabe; Kathleen A. Campbell
    ACTA PALAEONTOLOGICA POLONICA, 58, 2, 357, 382, Jun. 2013, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal
  • First occurrence of Pictetia (Ammonoidea) from the Albian of Japan and its systematical implications
    Rene Hoffmann; Yasuhiro Iba; Fumihisa Kawabe; Jore Mutterlose
    BULLETIN OF GEOSCIENCES, 88, 3, 517, 524, 2013, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal
  • First record of Immanitas (Bivalvia, Hippuritida) from northern California, U.S.A.
    Sano, S; Iba, Y; Skelton, P.W; Aguilar-Pérez, J; Tanabe, K
    Caribbean Journal of Earth Sciences, 44, 77, 84, 2013, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal
  • Belemnites originated in the Triassic-A new look at an old group
    Yasuhiro Iba; Shin-ichi Sano; Joerg Mutterlose; Yasuo Kondo
    GEOLOGY, 40, 10, 911, 914, Oct. 2012, [Peer-reviewed], [Lead author, Corresponding author], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal
  • First record of an Early Barremian caprinid rudist from Japan - implications for the palaeobiogeography of the Caprinidae (Bivalvia)
    Shin-Ichi Sano; Peter W. Skelton; Megumi Watarai; Yasuhiro Iba; Yasuo Kondo; Yuichiro Sato
    PALAEONTOLOGY, 55, 4, 843, 851, Jul. 2012, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal
  • The age of the Lower Cretaceous Osaka Formation in eastern Kyushu Island, Southwest Japan
    佐野 晋一; 伊庭 靖弘; 佐藤 裕一郎
    福井県立恐竜博物館紀要, 11, 19, 25, 福井県立恐竜博物館, 2012, [Peer-reviewed], [Domestic magazines]
    Japanese
  • Calcareous nannofossil biostratigraphic study of forearc basin sediments: Lower to Upper Cretaceous Budden Canyon Formation (Great Valley Group), northern California, USA
    Allan Gil S. Fernando; Hiroshi Nishi; Kazushige Tanabe; Kazuyoshi Moriya; Yasuhiro Iba; Kazuto Kodama; Michael A. Murphy; Hisatake Okada
    ISLAND ARC, 20, 3, 346, 370, Sep. 2011, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal
  • A Tethyan bivalve, Neithea (Cretaceous pectinid) from northern California, and its biogeographic implications
    Yasuhiro Iba; Shin-ichi Sano; Kazushige Tanabe
    PALEONTOLOGICAL RESEARCH, 15, 2, 62, 67, Jun. 2011, [Peer-reviewed], [Lead author, Corresponding author], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal

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  • Belemnite extinction and the origin of modern cephalopods 35 m.y. prior to the Cretaceous-Paleogene event
    Yasuhiro Iba; Joerg Mutterlose; Kazushige Tanabe; Shin-ichi Sano; Akihiro Misaki; Kazunobu Terabe
    GEOLOGY, 39, 5, 483, 486, May 2011, [Peer-reviewed], [Lead author, Corresponding author], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal

    Preprint
  • Orbitolinid foraminifers in the Northwest Pacific: Their taxonomy and stratigraphy
    Yasuhiro Iba; Shin-ichi Sano; Takashi Miura
    MICROPALEONTOLOGY, 57, 2, 163, 171, 2011, [Peer-reviewed], [Lead author, Corresponding author], [International Magazine]
    English, Scientific journal

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  • Deposition of serpentine-bearing conglomerate and its implications for Early Cretaceous tectonics in northern Japan
    Kohki Yoshida; Yasuhiro Iba; Shuichi Taki; Masaru Sugawara; Tatsuro Tsugane; Yoshinori Hikida
    SEDIMENTARY GEOLOGY, 232, 1-2, 1, 14, Dec. 2010, [Peer-reviewed], [International Magazine]
    English, Scientific journal
  • A late Middle Jurassic boreal belemnite Cylindroteuthis from central Japan and its paleobiogeographic implications
    Sano, S; Goto, M; Dzyuba, O.S; Iba, Y
    Memoir of the Fukui Prefectural Dinosaur Museum, 9, 9, 1, 7, 福井県立恐竜博物館, 2010, [Peer-reviewed], ［Internationally co-authored］, [Domestic magazines]
    English, Scientific journal, Abstract: A single rostrum of Cylindroteuthis (Cylindroteuthis) cf. theofilaktovi Nikitin recovered from the Late Bathonian- Early Callovian Kaizara Formation of the Tetori Group in Shimoyama, Kuzuryu area, Central Japan, is described for the first time in East Asia. This belemnite species has been previously known only from the Early Callovian of Central Ukraine in Eastern Europe. Since the family Cylindroteuthididae has been considered as the typical Boreal or northern element in the Jurassic belemnite paleobiogeographic studies, its occurrence in the Inner Zone (Japan Sea side) of Southwest Japan clearly indicates that Cylindroteuthis expanded its distribution to the mid-latitudes of the Northwest Pacific at that time. This expansion possibly corresponds to the Early Callovian spread of boreal cylindroteuthids toward south into Europe in the Boreal-Atlantic seas. The occurrence of Cylindroteuthis from the Kaizara Formation strongly suggests that a cooler current possibly from the Arctic reached the Tetori Basin in the Late Bathonian-Early Callovian time.



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    http://www.dinosaur.pref.fukui.jp/archive/memoir/memoir009.html
  • First record of Late Albian canaliculate rudist from northern California and re-assessment of Durania? californica Anderson, 1958
    Yasuhiro Iba; Shin-ichi Sano; Peter W. Skelton; Hiroyuki Kagi; Kazushige Tanabe
    CRETACEOUS RESEARCH, 30, 3, 540, 546, Jun. 2009, [Peer-reviewed], [Lead author, Corresponding author], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal

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  • Early Albian Mytiloides (Inoceramidae, Bivalvia) from the Northwest Pacific: a pioneering species for Late Cretaceous inoceramid diversification
    Akinori Takahashi; Yasuhiro Iba
    PALEONTOLOGICAL RESEARCH, 13, 2, 199, 205, Jun. 2009, [Peer-reviewed], [Last author], [International Magazine]
    English, Scientific journal

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  • An Early Albian Arctic-type ammonite Arcthoplites from Hokkaido, northern Japan, and its paleobiogeographic and paleoclimatological implications
    Yasuhiro Iba
    JOURNAL OF ASIAN EARTH SCIENCES, 34, 1, 46, 50, Jan. 2009, [Peer-reviewed], [Lead author, Corresponding author], [International Magazine]
    English, Scientific journal

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  • The Early Cretaceous in situ shallow-marine carbonates containing typical Tethyan biota in the Ishido Formation, Kanto Mountains, central Japan
    Iba. Y; Hirauchi
    Journal of Geological Society of Japan, 115, V, VI, 2009, [Peer-reviewed], [Lead author, Corresponding author], [Domestic magazines]
    English, Scientific journal
  • Paleobiogeography of the pectinid bivalve Neithea, and its pattern of step-wise demise in the Albian Northwest Pacific
    Yasuhiro Iba; Shin-ichi Sano
    PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, 267, 1-2, 138, 146, Sep. 2008, [Peer-reviewed], [Lead author, Corresponding author], [International Magazine]
    English, Scientific journal

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  • Campanian climatic change: Isotopic evidence from Far East, North America, North Atlantic and Western Europe
    Yuri D. Zakharov; Yasunari Shigeta; Kazushige Tanabe; Yasuhiro Iba; Olga P. Smyshlyaeva; Ekaterina A. Sokolova; Alexander M. Popov; Tatiana A. Velivetskaya; Tamara B. Afanasyeva
    ACTA GEOLOGICA SINICA-ENGLISH EDITION, 81, 6, 1049, 1069, Dec. 2007, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal
  • Mid-Cretaceous step-wise demise of the carbonate platform biota in the Northwest Pacific and establishment of the North Pacific biotic province
    Yasuhiro Iba; Shin-ichi Sano
    PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, 245, 3-4, 462, 482, Mar. 2007, [Peer-reviewed], [Lead author, Corresponding author], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal
  • The first Pacific record of the Late Aptian warming event
    Reishi Takashima; Shin-Ichi Sano; Yasuhiro Iba; Hiroshi Nishi
    JOURNAL OF THE GEOLOGICAL SOCIETY, 164, 2, 333, 339, Mar. 2007, [Peer-reviewed], [International Magazine]
    English, Scientific journal
  • Albian demise of the Tethyan biota in the Pacific: A possible causal link to the formation of the South Atlantic and Western Interior Seaway
    Iba, Y; Sano, S
    Geophysical Research Abstract, 9, 03250, 03250, 2007, [Peer-reviewed], [Lead author, Corresponding author], [International Magazine]
    English, Symposium

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  • Mesorbitolina (Cretaceous larger foraminifera) from the Yezo Group in Hokkaido, Japan and its stratigraphic and paleobiogeographic significance
    Yasuhiro Iba; Shin-ichi Sano
    PROCEEDINGS OF THE JAPAN ACADEMY SERIES B-PHYSICAL AND BIOLOGICAL SCIENCES, 82, 7, 216, 223, Sep. 2006, [Peer-reviewed], [Lead author, Corresponding author], [International Magazine]
    English, Scientific journal

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  • Two coleoid jaws from the Upper Cretaceous of Hokkaido, Japan
    K Tanabe; Y Hikida; Y Iba
    JOURNAL OF PALEONTOLOGY, 80, 1, 138, 145, Jan. 2006, [Peer-reviewed], [International Magazine]
    English, Scientific journal

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  • Discovery of the uncorformity between the Sanchu Cretaceous and serpentinite in the northwestern Kanto Mountains, central Japan and its significance
    Hirauchi, K; Hisada, K; Iba, Y
    Journal of Geological Society of Japan, 112, 7, 452, 458, The Geological Society of Japan, 2006, [Peer-reviewed], [Domestic magazines]
    Japanese, Scientific journal, Serpentinite bodies are distributed along fault boundaries between the Sanchu Cretaceous and the rocks of the Southern Chichibu Belt in the northwestern Kanto Mountains, central Japan. It has been thought that the relationship of the Sanchu Cretaceous and the serpentinite is a fault contact, but we found an outcrop where the Shiroi Formation (brackish sediments) of the Cretaceous covers the serpentinite unconformably. The contact surface is undulatory in geometry and is oblique to the bedding plane of the basal Shiroi Formation. Serpentinite clasts are included in the basal part of the Shiroi Formation. The microscopic texture of serpentinite clasts consists mostly of antigorites and differs from the textures of underlying serpentinite. It is clear that the serpentinite occurs in two different manners, that is, a constituent of the fault zone and a basement rock of the Sanchu Cretaceous. Almost serpentinite clasts were derived from antigoriterich serpentinite bodies nearby. We can conclude that the serpentinite body along the Otchizawa River was protruded on the brackish area immediately before the initial sedimentation of the Shiroi Formation (Hauterivian).

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  • Discovery of serpentinite bearing conglomerate in the lower Yezo Group, Hokkaido, northern Japan and its tectonic significance
    Yoshida, K; Taki, S; Iba, Y; Hikida, Y
    Journal of Geological Society of Japan, 109, 6, 336, 344, The Geological Society of Japan, 2005, [Peer-reviewed], [Domestic magazines]
    Japanese, Scientific journal, Evidence of solid tectonic intrusion and following subaqueous exposure of the serpentinite in the Lower Yezo Group (Lower Cretaceous) is reported. The Yezo Group comprises the lower part of the Yezo Super-group which consists of the Early Cretaceous to Earliest Paleogene fore-arc basin-fill sediments. Several conglomeratic beds containing serpentinite clasts are found in the Kamiji Formation of the Lower Yezo Group in the Teshio Nakagawa area, northern Hokkaido. This Formation mainly consists of alternation of sandstone and mudstone, pebbly mudstone and thick-bedded sandstone, all formed as sediment-gravity-flow deposits. Subangular to subrounded serpentinite clasts are frequently found as granules in pebbly mudstones and lag of thick-bedded sandstones, which are sporadically associated with calcareous fragments of marine fauna such as crinoid, belemnite and Neithea. Although later clay-forming alteration and carbonatization obscured most original texture of the serpentinite, remaining serpentine minerals reveal its ultra-basic origin. Oolitic limestones with some detrital chromian spinels and serpentinite nuclei sometimes coexist with the serpentinite clasts in the conglomerate. Chemical composition of detrital chromian spinels in the sandstone suggests their derivation from depleted mantle peridotite. Abundant serpentinite clasts strongly suggest proximity of the source rock body in view of the extremely low durability of serpentinite against abrasion during transportation and sedimentation. Serpentinite particles associated with ooids and detrital chromian spinels in oolitic limestone also imply that the serpentinite body cropped out in a shallow marine environment. Bioclasts, serpentinite, carbonate clasts and other detritus were mixed and episodically flowed down into the deeper part of the basin to form the above serpentinite bearing conglomerate, suggesting solid serpentinite intrusion and simultaneous exposure in a Lower Cretaceous forearc basin floor.
  • Orbitolina-bearing limestone pebbles from the lowermost part of the Lower Yezo Group (Lower Cretaceous) in the Nakagawa area, northern Hokkaido, Japan and its significance
    Iba, Y; Taki, S; Yoshida, K; Hikida, Y
    Journal of Geological Society of Japan, 111, 2, 67, 73, The Geological Society of Japan, 2005, [Peer-reviewed], [Lead author, Corresponding author], [Domestic magazines]
    Japanese, Scientific journal, Larger foraminifera Orbitolina-bearing limestone pebbles were discovered in the conglomerate of the lowermost Lower Yezo Group in the Nakagawa area, northern Hokkaido, Japan. This is the first discovery of Orbitolina in this area. The conglomerate that includes the limestone pebbles is interpreted as a sediment gravity flow deposit into a deep-water basin. The limestone pebbles consist of either Orbitolina grainstone or oolitic-peloidal packstone/grainstone. The former is rich in Orbitolina tests which are typical and common in the mid-Cretaceous carbonate platform sediments of the Tethys-Atlantic region. The Orbitolina specimen identified belongs to the Orbitolina (Mesorbitolina) parva-O. (M.) texana lineage (Schroeder, 1975), which ranges from the Upper Aptian to the Lower Albian. The obtained Orbitolina data in addition to previous biostratigraphic studies suggest the Upper Aptian for the lowermost part of the Lower Yezo Group. During Late Aptian, the Orbitolina-bearing carbonate in the Nakagawa area was presumably deposited in a tropical shallow marine environment and then emplaced by sediment gravity flow into a deep-water basin. These geohistorical events in the Lower Yezo Group of the Nakagawa area are similar to those recorded in the Yubari Mountains, about 300 km south of Nakagawa, indicating the presence of these events across a wide area.

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■ Other Activities and Achievements
■ Books and other publications
  • 〔主要な業績〕地球惑星科学入門
    伊庭靖弘, 化石鉱脈
    北海道大学出版会, 2015, [Contributor]
  • 〔主要な業績〕地球と宇宙の化学辞典
    伊庭靖弘, 化石
    朝倉書店, 2012, [Contributor]
  • 〔主要な業績〕東大古生物学
    伊庭靖弘, ベレムナイト
    東海大学出版会, 2012, [Contributor]
  • 〔主要な業績〕古生物学辞典
    伊庭靖弘, 北太平洋区
    朝倉書店, 2010, [Contributor]
■ Lectures, oral presentations, etc.
  • Not ammonites, but squids: “the Cretaceous squid ocean” revealed by digital fossil-mining
    Ikegami S.; Takeda, Y.; Mutterlose, J.; Iba, Y.
    12th International Cretaceous Symposium, Leibniz University Hannover, Germany, Sep. 2025
    44573255;45130347;45160777;45039215;45392003
  • Complex chemical communication and advanced sociality of 100-million-year-old ants
    h International; Cretaceous Symposium; Leibniz University Hannover; Germany
    Sep. 2025
    44573255;45130347;44555961;45039215;45160777
  • Not ammonites, but sepioids: the oldest sepioid cephalopod from the Cretaceous discovered by zero-shot learning AI
    Sugiura, K.; Ikegami S.; Takeda, Y.; Mutterlose, J.; Derin, M. O.; Kubota, A.; Nishida, H.; Tainaka, K.; Harada, T.; Landman, N. H.; Iba, Y.
    12th International Cretaceous Symposium, Leibniz University Hannover, Germany, Sep. 2025
  • 〔Major achievements〕A new amber Lagerstätte from the Lower Cretaceous (upper Aptian) of northern Japan
    Aya Kubota; Taniguchi Ryo; Hikida Yoshinori; Iba Yasuhiro
    12th Cretaceous Symposium, Germany, Aug. 2025
  • 〔Major achievements〕Amber in the deep sea: evidence for large-scale paleo-tsunamis?
    Aya Kubota; Yusuke Takeda; Keewook Yi; Shin-ichi Sano; Yasuhiro Iba
    12th Cretaceous Symposium, Germany, Aug. 2025
    44555961;44573255;45160777;45130347
  • 〔Major achievements〕Digital fossil-mining
    Yasuhiro Iba
    日本古生物学会2025年年会・総会, Jun. 2025
    [Invited]
  • Late Cretaceous Angiosperm variation in Hokkaido, Japan: New permineralized flowers found by using an innovating method MULPIS
    Tsubasa Ohmori; Aya Kubota; Harufumi Nishida; Shin Ikegami; Yusuke Takeda; Yasuhiro Iba
    XI International Organization of Palaeobotany Conference, Prague, May 2024
    44573255;45130347;45160777;44555961
  • 〔Major achievements〕Reconstructing the Devonian Rhynie Chert plants using a new high-resolution imaging technique, MULPIS
    Nao Kawagoe; Harufumi Nishida; Aya Kubota; Alexander J Hetherington; Yusuke Takeda; Oguz Derin Mehmet; Yasuhiro Iba
    XI International Organization of Palaeobotany Conference, Prague, May 2024
    44573255;44555961;45130347;45160777
  • 〔主要な業績〕あらゆる内部構造をフルカラーでとらえる次世代トモグラフィとデータ解析技術 ―ボリュームデータが描く新たな自然―
    伊庭靖弘; 竹田裕介
    第37回日本糖尿病・肥満動物学会年次学術集会 (弘前大学）, Mar. 2024, Invited oral presentation
    44573255;45130347;45160777, [Invited]
  • Voyage into the Devonian Rhynie Chert ecosystem using a new high-resolution imaging technique, MULPIS
    Harufumi Nishida; Aya Kubota; Nao Kawagoe; Yusuke Takeda; Yasuhiro Iba
    The annual meeting of the Linnean Society Palaeobotany Specialist Group, London, UK, 22 Nov. 2023, English, Oral presentation
  • 月面サンプルリターン:近赤外顕微分光カメラと研削機構の開発
    仲内 悠祐; 長岡 央; 大竹 真紀子; 前田 孝雄; 諸田 智克; 深井 稜汰; 伊庭 靖弘; 佐伯 和人; 吉光 徹雄; 森 治; 佐伯 孝尚
    惑星科学会秋季講演会, Oct. 2023, Japanese, Oral presentation
  • 超高解像トモグラフィ・３Dレンダリング技術を用いたアエンデ隕石中の難揮発性凝縮物の形状観察
    増田雄樹; 竹田裕介; 深井稜汰; 伊庭靖弘; 笹木慎太郎; 池上森; 臼井寛裕; 奥住聡; 荒川創太
    日本惑星科学会 2023年秋季講演会, Oct. 2023, Japanese, Oral presentation
  • Mid-Cretaceous rudists in the northern part of Myanmar and their paleobiogeographic significance.
    Shin-ichi SANO; Yasuhiro IBA; Aya KUBOTA; Tin Tin LATT; Saw Mu Tha Lay PAW; Thura OO
    2nd Asian Palaeontological Congress, Tokyo, Japan, Aug. 2023, English, Poster presentation
  • Variations in terpenoid composition in Japanese amber extracts: diagenesis and chemotaxonomy
    Hideto Nakamura; Aya Kubota; Yasuhiro Iba; Hiroki Yano; Masashi A. Ikeda; Takuto Ando
    Water Rock Interaction WRI-17, Sendai, Japan, Aug. 2023, English, Oral presentation
  • A new pentamerous flower discovered from the Late Cretaceous (Turonian) of Hokkaido, Japan by using an innovative method of fossil hunting.
    Harufumi Nishida; Aya Kubota; Yusuke Takeda; Yasuhiro Iba
    2023-ISCDS/JFFP3, China, Aug. 2023, English, Keynote oral presentation
  • An enigmatic new taxon from Central Pacific highlights mosaic evolution among the family Hippuritidae (Bivalvia).
    Ayaka Ito; Shin-ichi Sano; Yasuhiro Iba; Yusuke Takeda; Peter W. Skelton; Yolanda M. Aguilar; Roberto S; P. de Ocamo; Tomoki Kase
    2nd Asian Palaeontological Congress, Tokyo, Japan, Aug. 2023, English, Poster presentation
  • Anatomically preserved pentamerous flower from the Late Cretaceous (Turonian) of Hokkaido, Japan.
    Aya Kubota; Shin Ikegami; Yusuke Takeda; Yasuhiro Iba; Harufumi Nishida
    Asian Palaeontological Congress, Tokyo, Japan,, Aug. 2023, English, Poster presentation
  • Late Cretaceous Gymnosperm diversity in Hokkaido, Japan: A possible new order based on a permineralized fructification exhibiting new type of seed enclosure and pollentube fertilization
    Harufumi Nishida; Aya Kubota; Yusuke Takeda; Yasuhiro Iba
    2nd Asian Palaeontological Congress, Tokyo, Japan, Aug. 2023, English, Oral presentation
  • Three-dimensional reconstruction of the in situ mode of life of embedded Cambrian coralla using grinding tomography
    Mei Kishida; Yusuke Takeda; Yoichi Ezaki; Natsuko Adachi; Jianbo Liu; Yasuhiro Iba
    2nd Asian Palaeontological Congress, Aug. 2023, English, Oral presentation
  • High-Resolution Grinding Tomography of Coarse-Grained Calcium-Aluminum-Rich Inclusions in the Allende Meteorite.
    Ryota Fukai; Yuki Masuda; Yusuke Takeda; Yasuhiro Iba; Shintaro Sasaki; Shin Ikegami; Daiki Yamamoto; Masaki Yamazaki
    The Meteoritical Society Conference, Aug. 2023, English, Oral presentation
  • Development of Vis-NIR microscopic hyper imager and grinding device for sample-return from the Moon
    仲内 悠祐; 長岡 央; 大竹 真紀子; 諸田 智克; 佐伯 和人; 吉光 徹雄; 森 治; 深井 稜汰; 伊庭 靖弘
    日本地球惑星科学連合2023年大会, May 2023, English, Poster presentation
  • 赤道太平洋域産ヒップリテス科厚歯二枚貝の左殻内部形態とその進化史上の意義
    伊藤綾花; 佐野晋一; 竹田裕介; 伊庭靖弘
    日本古生物学会 第172回例会, Feb. 2023, Japanese, Poster presentation
  • 超高解像トモグラフィ・3D レンダリング技術による隕石中の難揮発性包有物の形状観察
    深井稜汰; 竹田裕介; 増田雄樹; 伊庭靖弘; 笹木慎太郎; 池上森; 山本大貴; 臼井寛裕; 星野健; 山崎雅起
    ⽇本惑星科学会 2022年秋季講演会, Sep. 2022, Japanese, Oral presentation
  • Hippuritid rudist bivalves possibly originated in the Pacific: an enigmatic new taxon from the Philippines with primitive and “derived” morphological characters
    A. Ito; S. Sano; Y. Iba; P. W. Skelton; Y. M. Aguilar; R. De Ocampo; T. Kase
    11th International Cretaceous Symposium, Warsaw, Poland, 23 Aug. 2022, Oral presentation
    22 Aug. 2022 - 26 Aug. 2022
  • A new hippuritid rudist bivalve from the Caramoan Peninsula, the Philippines, sheds new light on the evolutionary history of the Hippuritidae
    A. Ito; S. Sano; Y. Iba; P. W. Skelton; Y. M. Aguilar; R. De Ocampo; T. Kase
    World Congress of Malacology 2022, 03 Aug. 2022, Oral presentation
    01 Aug. 2022 - 05 Aug. 2022
  • カンブリア紀サンゴCambroctoconusの原地性生活様式の三次元復元 隠棲生息場に即応した無性増殖と群体成長
    江﨑洋一; 岸田明生; 竹田裕介; 足立奈津子; Liu Jianbo; 伊庭靖弘
    日本古生物学会 2022年年会, 02 Jul. 2022, Oral presentation
    01 Jul. 2022 - 03 Jul. 2022
  • 〔Major achievements〕A possible new gymnosperm order based on a megasporophyll bearing numerous ventral ovules from the Albian of Hokkaido, Japan
    Harufumi Nishida; Aya Kubota; Yusuke Takeda; Yasuhiro Iba
    11th European Palaeobotany and Palynology Conference, 20 Jun. 2022, Oral presentation
    19 Jun. 2022 - 22 Jun. 2022, [Invited]
  • 赤道太平洋域産ヒップリテス科厚歯二枚貝のオクラのような「折りたたみ構造」の形成過程
    伊藤綾花・佐野晋一・伊庭靖弘
    日本古生物学会第171回例会, 05 Feb. 2022, Oral presentation
    03 Feb. 2022 - 06 Feb. 2022
  • 赤道太平洋域からの新たなヒップリテス科厚歯二枚貝とその起源
    伊藤綾花; 佐野晋一; 伊庭靖弘; P. W. Skelton; Y. M. Aguilar; R. De Ocampo; 加瀬友喜
    日本古生物学会2021年年会, 03 Jul. 2021, Oral presentation
    02 Jul. 2021 - 04 Jul. 2021
  • JSS3大規模チャレンジによる大規模画像データの3次元可視化
    竹田 裕介; 田井中一貴; 星野健; 深井稜汰; 臼井寛裕; 笹木慎太郎; 池上森; 伊庭靖弘
    第53回流体力学講演会/第39回航空数値シミュレーション技術シンポジウム, 01 Jul. 2021
    30 Jun. 2021 - 02 Jul. 2021
  • 〔Major achievements〕微小感覚器官が明らかにする白亜紀ゴキブリの知覚システムと生態
    谷口諒; 伊庭靖弘; 西野浩史; 渡邉英博; 立石康介
    日本地球惑星科学連合, 03 Jun. 2021
    30 May 2021 - 09 Jun. 2021
  • 微小感覚器官の高分解能可視化による化石ゴキブリの生態復元
    谷口諒; 西野浩史; 伊庭靖弘
    日本古生物学会 第 170 回例会, 06 Feb. 2021, Oral presentation
    05 Feb. 2021 - 07 Feb. 2021
  • 次世代トモグラフィ技術による形態情報の多次元デジタル化
    竹田裕介; 笹木慎太郎; 池上森; 久保田彩; 西田治文; 伊庭靖弘
    日本顕微鏡学会第63回シンポジウム, 20 Nov. 2020, Japanese, Invited oral presentation
    20 Nov. 2020 - 21 Nov. 2020, [Invited]
  • 次世代トモグラフィー装置の開発 －病理学への革新的技術提供を目指して－
    伊庭靖弘
    日本病理学会カンファレンス テクノロジーの進歩とともに発展する病理学, 02 Aug. 2019, Japanese, Invited oral presentation
    02 Aug. 2019 - 03 Aug. 2019, [Invited]
  • 次世代イメージング装置による地球生命化石探査法の革新：火星への応用可能性
    伊庭靖弘; 長谷川精; 竹田祐介; 足立悠海; 池上森; 笹木慎太郎
    第２回月着陸探査研究会, 23 Feb. 2019, Oral presentation
    22 Feb. 2019 - 23 Feb. 2019
  • First record of rudist bivalves from Cretaceous limestone in the northern part of Myanmar (a preliminary report)
    Sano, S; Iba, Y; Tin Tin Latt; Kubota, A; Saw Mu Tha Lay Paw; Thura Oo
    The Palaeontological Society of Japan 2018, 24 Jun. 2018, Oral presentation
    22 Jun. 2018 - 24 Jun. 2018
  • 〔主要な業績〕太平洋の中生代化石記録から探る新しいバイオイベント
    伊庭靖弘
    日本地質学会・長野大会, Sep. 2015, Japanese, Invited oral presentation
    [Invited], [Domestic Conference]
  • 〔Major achievements〕Belemnites originated in the Triassic ­A new look at an old group.
    Iba, Y; Sano, S; Fuchs, D; Liu, J; Mutterlose, J
    2nd Symposium of Earth History of Asia, 2014, English, Invited oral presentation
    [Invited], [International presentation]
  • 〔Major achievements〕Early evolutionary history of belemnites, revisited: New perspectives from East Asia
    Iba, Y; Sano, S; Fuchs, D; Sha, J; Liu, J; Mutterlose, J
    9th International Symposium Cephalopod Present and Past, 2014, English, Keynote oral presentation
    [Invited], [International presentation]
  • Evolutionary history of belemnites, revisited: Perspective from East Asia
    Iba, Y
    Non­Vertebrate Palaeontological meeting, Nanjing Institute of Geology and Palaeontology, 2013, English, Keynote oral presentation
    [Invited], [International presentation]
  • 〔Major achievements〕Evolutionary history of belemnites, revisited
    Yasuhiro Iba
    シンポジウム：白亜紀研究の進展，日本古生物学会, 2011, Japanese, Invited oral presentation
    [Invited], [Domestic Conference]
  • The mid­Cretaceous biogeographic revolution in the Pacific: A consequence of changes in oceanic gateways.
    Iba Y; Sano S
    The 75th Anniversary symposium of the Paleontological Society of Japan, "The Mesozoic Revolution: a global biological transformation", 2010, English, Invited oral presentation
    [Invited], [International presentation]
  • Molecular composition of Japanese Cretaceous amber extracts: chemotaxonomic significance of terpenoid biomarkers.
    Hideto Nakamura; Yasuhiro Iba; Aya Kubota
    The 39th Symposium of the Japanese Association of Organic Geochemists, English, Oral presentation
■ Syllabus
  • 地球惑星システム科学概論, 2024年, 修士課程, 理学院
  • 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
  • 自然史科学特別研究１, 2024年, 修士課程, 理学院
  • 自然史科学論文講読１, 2024年, 修士課程, 理学院
  • 地質学実習, 2024年, 学士課程, 理学部
  • 古生物学, 2024年, 学士課程, 理学部
  • 地球惑星科学Ⅰ, 2024年, 学士課程, 全学教育
  • 現代地球惑星科学概論１, 2024年, 学士課程, 理学部
■ Affiliated academic society
  • THE GEOLOGICAL SOCIETY OF JAPAN
  • PALAEONTOLOGICAL SOCIETY OF JAPAN
■ Works
  • uploadmonitor
    Yusuke Takeda; Yasuhiro Iba, 01 Mar. 2022 - Present, Image data transfer status monitoring application for imaging equipment, [Software]
  • UnzipGD
    Yusuke Takeda; Aya Togashi; RInto Noguchi; Yasuhiro Iba, 01 Mar. 2022 - Present, Automatic decompression/curation application for large image data compressed files downloaded from Goodle Drive., [Software]
  • macmini cluster wiki
    Yusuke Takeda; Rinto Noguchi; Aya Togashi; Yasuhiro Iba, 01 Mar. 2022 - Present, Development procedure for a low-cost parallel computer for large-scale image data curation using Apple’s macmini., [Web service]
■ Research Themes
  • Gross biological analysis of Devonian Rhynie Chert flora using innovative observation method
    Grants-in-Aid for Scientific Research
    01 Apr. 2023 - 31 Mar. 2026
    西田 治文; 久保田 彩; 伊庭 靖弘
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Chuo University, 23K27235
  • Gross biological analysis of Devonian Rhynie Chert flora using innovative observation method
    Grants-in-Aid for Scientific Research
    01 Apr. 2023 - 31 Mar. 2026
    西田 治文; 久保田 彩; 伊庭 靖弘
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Chuo University, 23H02544
  • Whole human brain pathological analysis by 3D imaging with single cell resolution
    Grants-in-Aid for Scientific Research
    01 Apr. 2022 - 31 Mar. 2025
    田井中 一貴; 伊庭 靖弘; 竹田 裕介
    田井中は、これまでに有機溶媒を用いたヒト脳組織透明化技術を改良し、光シート照明型顕微鏡による3Dイメージング後のサンプルに対して、非常に簡便な溶液処理によりパラフィン包埋へとシームレスに接続できる化学処理法を確立している。また、この化学処理法では、検体の形状がほぼ保たれるため、3Dイメージングで観察される座標を保ったままパラフィン切片を取得することができる。これにより、組織透明化・3Dイメージングによって、広範囲に組織検体の構造物を観察した後に、従来の二次元神経病理解析手法に接続し、より詳細なpost hoc免疫組織化学的解析が可能である。また、田井中・伊庭は、この化学処理法を更に改良し、透明化後の検体に最適化された樹脂を包埋することで、トモグラフィ装置により研磨可能な包埋法を確立した。昨年度までに1 cm3のヒト脳ブロックの細胞核を網羅的に検出することに成功していたが、より大きな1 cm厚のヒト脳スライスでは、組織深部の細胞核が十分に染色されていないことが分かった。今年度は、ヒト脳スライスに対する核染色プロトコールの最適化を行うことで、組織全域への均一な核染色に成功し、トモグラフィイメージングによるヒト脳スライスの細胞核の網羅的検出に成功した。更に、伊庭・竹田は、トモグラフィ装置で取得されたヒト脳イメージングデータを解析し可視化する前処理フローの構築を行った。数万枚以上のRAWファイルを画像ファイルに変換し、規則に従ってファイル名を変更したうえで保存するフローを自動化した。系統的かつ自動的なデータ処理が可能となったことで、これらの画像を用いた細胞核抽出のための解析・可視化へスムースに移行することが可能となった。加えて、大規模画像データイメージングに特化した計算機システムを構築し、これを用いた可視化実験を行った。
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Niigata University, 23K24198
  • Whole human brain pathological analysis by 3D imaging with single cell resolution
    Grants-in-Aid for Scientific Research
    01 Apr. 2022 - 31 Mar. 2025
    田井中 一貴; 伊庭 靖弘; 竹田 裕介
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Niigata University, 22H02937
  • Verification of the geological age of LECA and the early radiation of eukaryotes
    Grants-in-Aid for Scientific Research
    07 Oct. 2021 - 31 Mar. 2025
    柏山 祐一郎; 堤 之恭; 久保田 彩; 谷藤 吾朗; 伊庭 靖弘
    Japan Society for the Promotion of Science, Fund for the Promotion of Joint International Research (Fostering Joint International Research (B)), Fukui University of Technology, 21KK0061
  • Why did rudist bivalves flourish in the reefal environments in the Cretaceous Greenhouse Earth? -Early evolution of the Hippuritidae
    Grants-in-Aid for Scientific Research
    01 Apr. 2020 - 31 Mar. 2023
    佐野 晋一; 伊庭 靖弘
    本研究で対象とする，最も重要なタクサの一つである，フィリピン・カラモアン半島産ヒップリテス科厚歯二枚貝（本科最古の記録の可能性がある新属新種）について，形態の詳細な解析を進めた結果，次のような新知見が得られた．左殻は，両殻の合わせ目において，右殻に存在する「外層の折りたたみ構造」に沿った「落とし蓋」のような形状を持つこと，本科には珍しく，上方にやや膨らんだ外形を持つこと，さらに本科を特徴づけるcanal and pores systemを持たないことが判明した．これらの特徴は，後期白亜紀後半に主にカリブ海地域に栄えたTorreites属と共通しており，Torreites属は，従来想定されていた，特殊化したヒップリテス科ではなく，むしろ原始的な特徴を残した，当時の「生きている化石」であった可能性が想起される．また，本タクサを特徴づける，右殻の「外層の折りたたみ構造」の，個体成長を通じた変化を検討した結果，幼生段階では「折りたたみ構造」を持たず，成長を通じて，１本ずつ追加されていき，最終的に７本もしくは８本の「折りたたみ構造」を持つこと，「折りたたみ構造」の形成場所や形成順には一定のルールがあることがわかった．このことは，「外層の折りたたみ構造」の形成がメカニカルな要因で制御されていることを示唆しており，また， 個体発生を通じて，折りたたみ構造を持たないポリコニテス科Horiopleuraの段階からヒップリテス科のHippuritella/Hippurites段階，Vaccinites段階を経て，本タクサへという，系統発生を「繰り返す」という見方もできる．以上より，カラモアン産ヒップリテス科の認識により，本科の初期進化史を完全に書き換える必要性を指摘できる．今後は，本タクサとポリコニテス科の派生的な種との形態の比較から，ヒップリテス科の標徴の獲得過程についても議論したい．
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), University of Toyama, 20K04145
  • 古生物デジタル標本の登録・保管・再利用システムの構築
    科学研究費助成事業
    29 Jun. 2018 - 31 Mar. 2023
    伊藤 泰弘; 伊庭 靖弘
    本研究の目的は、博物館における化石標本資料に関するさまざまなデジタルデータ、いわゆる「デジタル標本」について登録・保管し、再利用できる研究基盤システムを構築することである。本研究では、Ｘ線ＣＴ、３Ｄスキャナ、フォトグラメトリ（写真測量法）の主要な三次元データに重点を絞り、これらに基づいてシステムを構築することで、本研究目的を達成させる。
    本研究は新型コロナウイルス（Covid-19）感染拡大等による影響のため研究期間を延長したが、令和３年度も引き続きコロナ感染拡大防止対策により他県への出張研究等、活動が制限されることが予想された。そのため、他研究機関、特に県外に出張してのデータ取得・収集は最小限にし、研究代表者の所属機関である九州大学における所蔵標本に重点を置いて、学内および県内の研究機関を利用して３次元形態データの取得・収集を行う計画とした。
    本年度は、九州大学総合研究博物館所蔵の貝化石標本、および化石研究に使用するための現生貝類コレクションについて、九州大学総合研究博物館に設置された３Ｄスキャナ、および福岡県工業技術センター機械電子研究所設置のマイクロフォーカスＸ線ＣＴシステムを使用して形態の三次元データの取得を進めた。そのほかフォトグラメトリ・データ取得のための写真撮影を行った。また、本研究では、これら標本から取得した３次元形態データをウェブサイト上で一般に公開する計画であるが、そのための３次元データをウェブ・ブラウザ上で操作できるシステムおよびデータベースの構築を進めた。
    日本学術振興会, 挑戦的研究(萌芽), 九州大学, 18K18523
  • Understanding of biochemistry of chlorophyll c to shed light on evolution of marine primary production over the Phanerozoic Eon
    Grants-in-Aid for Scientific Research
    01 Apr. 2018 - 31 Mar. 2023
    柏山 祐一郎; 原田 二朗; 塚谷 祐介; 神川 龍馬; 力石 嘉人; 木下 雄介; 谷藤 吾朗; 伊庭 靖弘
    本研究では，①クロロフィルｃの生合成関連遺伝子・タンパク質の探索，②クロロフィル類の分解代謝経路に関わる遺伝子・タンパク質の探索，③クロロフィルｃを有する藻類およびその起源に関わる系統の真核生物の地質情報の研究の３つのアプローチを同時進行させてきた。②に関して，最古の真核藻類の出現時期の再検証の必要のため，カナダおよびアメリカの研究者とカナダの北極圏サマセット島への２年度にわたる共同調査の実施が計画されていたがＣｏｖｉｄ－１９パンデミックの影響により中止を余儀なくされ，今後についても確実な実施の目処が立たないのが現実である。
    この状況を受けて，研究の方向性を転換して，少なくとも今年度と来年度について，①と③の項目に集中することとした。すなわち，まず①に関しては，同様に未同定である二次植物のクロロフィルａ合成遺伝子の一部についても視野に入れて，網羅的に機能遺伝子の探索を進めた。ここでは，クロロフィルｃ合成系が二次植物にのみ見出される事実を重要視し，葉緑体獲得進化に伴う遺伝子重複により生じたクロロフィル合成関連遺伝子のパラログ候補を，全遺伝子情報が既に明らかとなっている有色および無職の珪藻類とクリプト藻類のデータベースから探索した。そして，有機合成した基質クロロフィル中間代謝産物を用いて in vitroでの酵素実験を実施し，いくつかの遺伝子について機能を特定した。これらについては，光合成バクテリアのクロロフィル合成関連遺伝子を欠損させた変異体群を作成したin vivo実験も展開している。③に関しては，分解代謝の研究のためのモデル生物として，これまでのPeranema trichophorumに加えて，珪藻捕食性の鞭毛虫Amastigomonada sp.についても，クロロフィル消化の有無でのトランスクリプトーム変化の解析を進めており，今度候補となる代謝遺伝子を探索していく。
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Fukui University of Technology, 18H03743
  • Innovations in fossil imaging methods using next-generation tomography equipment
    Grants-in-Aid for Scientific Research
    01 Apr. 2019 - 31 Mar. 2022
    Iba Yasuhiro
    Direct evidence of 4 billion years of life evolution and biodiversity is hidden in the strata as fossils. However, paleontology has so far been able to capture only a small fraction of the biodiversity of the past. This is due to the lack of technological innovation in methods for extracting fossils from rocks. In this study, we developed a new method to extract fossils from rocks as digital models with minimal bias. This innovative technique has been applied to various paleontological studies, demonstrating the high potential of this technology.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 19H02010
  • Predator-prey interactions between marine reptiles and coleoid cephalopods throughout the Mesozoic.
    Grants-in-Aid for Scientific Research
    01 Apr. 2016 - 31 Mar. 2019
    Iba Yasuhiro
    Modern-type coleoid cephalopod comprises squid, cuttlefish and octopuses. They had an important position in ancient ecosystems, as important prey for marine reptiles as do modern squids now. The evolutionary history of this group is, however, hardly known because of lack of their fossil records. Here we develop a novel tomographic method and reconstruct diversity of modern-type coleoid without collection bias throughout the Late Cretaceous. And also we reveal its predator-prey relationship with marine reptiles throughout the Mesozoic.
    Japan Society for the Promotion of Science, Grant-in-Aid for Young Scientists (B), Hokkaido University, 16K17825
  • Early evolutionary history of belemnites, revisited: Importance of East Asian fossil records
    Grants-in-Aid for Scientific Research
    01 Apr. 2013 - 31 Mar. 2016
    Iba Yasuhiro
    Belemnites (Belemnitida), a very successful group of Mesozoic cephalopods, provide an important clue for understanding Mesozoic marine ecosystems. Following current hypotheses, belemnites originated in the earliest Jurassic (201 to 197 Ma) with very small forms without prominent groove. According to this view their paleobiogeographic distribution was restricted to northern Europe until the Toarcian (183 to176 Ma). The fossil record is, however, biased by the fact that all the previous studies on belemnites so far focused on Europe. This study on fossil records conclude that the late Triassic to earliest Jurassic Belemnitida had a much higher diversity, and wider distribution than previously thought. It is postulated here that the belemnites did not originate in the earliest Jurassic in northern Europe, but in the Late Triassic in eastern Tethys (S.China). The fossil record of the Order Belemnitida is therefore extended by ~33 m.y. before the Triassic-Jurassic extinction event.
    Japan Society for the Promotion of Science, Grant-in-Aid for Young Scientists (B), Hokkaido University, 25800285
  • High resolution analysis for the response of life history traits of mollusks to marine environment during cold and warm geologic periods
    Grants-in-Aid for Scientific Research
    01 Apr. 2011 - 31 Mar. 2014
    TANABE Kazushige; ENDO Kazuyoshi; SASAKI Takenori; SHIRAI Kotaro; IBA Yasuhiro; MORIYA Kazuyoshi
    Response of life history traits of modern and Cretaceous mollusks to the present and past marine environment has been investigated by means of sclerochronological and geochemical analyses. As a result, modern bivalves living in northwestern Pacific cold water environments have a long life span and preserve a long-term environmental record in their internal shell increments. Stable oxygen isotopic analysis of well-preserved planktonic and benthic foraminiferal tests and bivalve shells from the Upper Cretaceous of the North American mid-continent reveals slightly colder sea surface and bottom temperatures for the Western Interior Seaways and Northwest Atlantic continental shelf during the Late Cretaceous than those during the mid-Cretaceous. Also, this study demonstrates that Late Cretaceous bivalves from these marine realms had life history traits that were similar to those of modern bivalves from a lower latitude warm marine environment.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), The University of Tokyo, 23340157
  • The Early Cretaceous paleobiogeography of belemnites in the Pacific
    Grants-in-Aid for Scientific Research
    2011 - 2012
    IBA Yasuhiro
    Belemnites, an extinct group of cephalopods, flourished in Mesozoic oceans. The rich and continuous fossil record of belemnites offers the potential for understanding the evolutionary dynamics of nektonic biota and its environmental factors. This study reveals two major biogeographic changes in the Early Cretaceous belemnites in the Pacific; 1) Occurrence of pandemic distribution of Tethyan-type belemnites, which can be correlated with the beginning of the Mid-Cretaceous global warming, and 2) An enigmatic distribution pattern of the Barremian belemnite in the NW and NE Pacific,indicating an existence of the “Cretaceous North Pacific Gyre”.
    Japan Society for the Promotion of Science, Grant-in-Aid for Research Activity Start-up, 23840002
■ Industrial Property Rights
  • 破壊型検査装置および検査法
    Patent right, 伊庭靖弘ほか
    特願2018-049964, 16 Mar. 2018