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A 5000-YEAR FOSSIL RECORD OF LARVAL SHELL MORPHOLOGY OF SUBMARINE CAVE MICROSHELLS |
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| Authors: | Takao Ubukata Akihisa Kitamura Mayumi Hiramoto Tomoki Kase |
| Institution: | Institute of Geosciences, Shizuoka University, 836 Oya, Suruga-ku, Shizuoka 422-8529, Japan;E-mail:;E-mail:;Toshin Juken Coorporation, 1-3-18 Takamido, Inazawa 492-8628, Japan;E-mail:;National Science Museum, 3-23-1, Hyakunin-cho, Shinjuku-ku, Tokyo 169-0073, Japan;E-mail: |
| Abstract: | A 5000-year fossil series of minute submarine cave bivalves was studied using morphometric and evolutionary analyses. The obtained results indicate that the shapes of larval shells of studied species were labile, whereas the size of the larval shell was stable in each species studied. This result is different than that previously reported in most other studies in which size change is more common than shape change. This unique evolutionary pattern of these bivalves might be attributed to their refugial lifestyle. |
| Keywords: | Cavernicolous bivalve eigenshape analysis evolutionary analysis microevolution random walk stratophenetic series |