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Accession number;03A0714647
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| Title;Adaptive strategy and evolution of corbiculoids based on the Japanese Mesozoic fossils. |
| Author;
MATSUKAWA MASAKI
(Tokyo Gakugei Univ.)
NAKADA KOSUKE
(Tokyo Gakugei Univ.)
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Journal Title;Bulletin of Tokyo Gakugei University. Section 4. Mathematics and Natural Sciences
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Journal Code:G0326A
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ISSN:0371-6813
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VOL.55;NO.;PAGE.161-189(2003)
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| Figure&Table&Reference;FIG.18, TBL.6, REF.70 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;Corbiculoids are widely distributed and flourished in the world from Mesozoic to Recent. Although they mainly inhabit fresh water and brackish water changeable environments, they have inhabited these environments without change in shell design since Mesozoic time. As corbiculoids occurred from the various horizons in Japanese Jurassic and Cretaceous, we can discuss the origin and change of corbiculoids with ecological and environmental analyses on fossil assemblages. Each species of corbiculoids is interpreted to have been derived from the Arcticidae, because corbiculoid species could not expand to other brackish water environments after speciation from marine species. The extinction of Neomiodontidae in Mid-Cretaceous time was caused by a decline of the ancestral lucinoid type of Arcticidae. To the contrary, cyrenoid type of Arcticidae have continuously provided for the Corbiculidae until the recent. This interpretation is supported by the solitary occurrence of Neomiodontidae Myrene (Mesocorbicula) tetoriensis from the Tetori Group and many occurrences of some species of Tetoria belonging to Corbiculidae from the various areas extending to the Northeast and Southwest Japan. The idea of origin and evolution of the corbiculoids can be explained by the allopatric speciation, punctuated equilibria and iterative evolution models. (author abst.) |
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