2023 Fiscal Year Final Research Report
Compound eye structure in trilobites, and these significances in adaptive radiation
| Project/Area Number |
21K03736
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 17050:Biogeosciences-related
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| Research Institution | Shizuoka University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
生田 領野 静岡大学, 理学部, 准教授 (60377984)
椎野 勇太 新潟大学, 自然科学系, 准教授 (60635134)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 三葉虫 / 複眼視覚 / 視野範囲 / 形態視 / 動体視 |
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| Outline of Final Research Achievements |
It is strongly suggested that the acquisitions of convex tergite morphology in trilobites lead to a higher flexibility in the positioning of the viewpoint relative to the sea floor, ultimately resulted in the differentiation and diversification of compound eye visual characteristics. Species with flat exoskeletal morphology had a wide anteroposterior and dorsal visual field and comparatively low ubiquity in resolution and photoreceptive capacity. Species with more or less convex exoskeleton vice versa. From the evolutionary perspectives, this is likely due to the spatial restriction of the visual field, which resulted easier to tune up the directionality of spatial resolution and photon-collecting ability.
The famous trilobite-evolutionary trend, the opposing diversity trend with decreasing taxonomy versus increasing morphological variabilities during the Ordovician, is likely be related with the effects of convex exoskeletal morphology on visual characteristics.
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| Free Research Field |
進化古生物学
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| Academic Significance and Societal Importance of the Research Achievements |
古くから蓄積されてきた化石記録にもとづいて興味深い生物進化のテンポやパターンが指摘されてきているが，なぜこのような傾向が生まれたのか，理由や要因に迫ることは極めて困難であった．化石生物の生体生理特性にもとづく検討を行うことで
それらのテンポやパターンの理由に言及している点が本研究の学術的意義でもあり，さらに社会的にも興味が抱かれる生物進化の諸現象について，時間軸に則った形態変化に対してこれらの成立理由を伴った形で明示することは大変意義深いと考えられる．
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