1996 Fiscal Year Final Research Report Summary
EVOLUTIONARY STUDY OF MARINE RELIC INVERTEBRATES
| Project/Area Number |
07304042
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 総合 |
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| Research Field |
Stratigraphy/Paleontology
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| Research Institution | THE UNIVERSITY OF TOKYO |
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Principal Investigator |
TANABE Kazushige Graduate School of Science, the University of Tokyo, Professor, 大学院・理学系研究科, 教授 (20108640)
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| Co-Investigator(Kenkyū-buntansha) |
CHIBA Satoshi School of Science, Shizuoka University, Associate Professor, 理学部, 助手 (10236812)
KASE Tomoki Department of Geology, National Science Museum, Senior Curator, 地学研究部, 室長 (20124183)
ENDO Kazuyoshi Graduate School of Science, University of Tokyo, Associate Professor, 大学院・理学系研究科, 助手 (80251411)
UESHIMA Rei Graduate School of Science, University of Tokyo, Lecturer, 大学院・理学系研究科, 講師 (20241771)
OJI Tatuo Graduate School of Science, University of Tokyo, Associate Professor, 大学院・理学系研究科, 助教授 (50160487)
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| Project Period (FY) |
1995 – 1996
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| Keywords | Invertebrates / Living Fossils / Evolution / Molecular biology / Developmental biology / Comparative anatomy / Taxonomy / Paleobiology |
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| Research Abstract |
(1) Ecological and taxonomic research : Kase, Hayami, Hanai, Tabuki, and Mori have found a peculiar primitive invertebrate faunas in the submarine caves in the tropical and subtropical Western Pacific. They collected many live and dead samples of the faunas and analyzed their ecological and taxonomic characteristic as a basis for future evolutionary researches.
(2) Developmental biological research : Tanabe has investigated the mode of embryonic shell development in the primitive ectocochliate cephalopod Nautilus with the help of Mr. K.Uchiyama of the Toba Aquarium, and recognized a disks-shaped univalved organic shell (cicatrix) in the early stage. A similar shaped disk-shaped or low cap shaped primary shell is also known in extant Monoplacophora, suggesting their phylogenetic relationships.
(3) Molecular systematic research : Endo, Ueshima, Ozawa, and Chiba have conducted DNA analysis of some primitive invertebrates such as brachiopods and stalked crinoids to establish their phylogenetic relationships at higher taxonomic levels.
(4) Theoretical research : Chiba constructed numerical models to explain the log-term phenotypic-level evolution based on the theory of quantitative genetics.
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