Migration and speciation of the Loxoconcha japonica species group (Ostracoda) in East Asia

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概要

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• Eighty-five fossil and Recent species of the genus Loxoconcha (Crustacea : Ostracoda) from East Asia are systematically reexamined. On the basis of carapace morphology, the genus Loxoconcha from East Asia is divided into five species groups : L. pulchra, L. optima, L. japonica, L. uranouchiensis and L. japonica species groups. The migration and speciation patterns of four species of the L. japonica species group are as follows. In Late Miocene, L. lilljeborgii and L. tumulosa were distributed over the Paleo-Indian Ocean. In Early Pliocene time, these species migrated to the Western Pacific and L. japonica evolved from populations of L. tumulosa by peramorphic evolution. In the Middle Pleistocene, L. shanhaiensis evolved from populations of L. japonica in the Ryukyu Islands by paedomorphic evolution.

• 2002-09-30

著者

• Tanaka Gengo

  Department Of Life And Earth Sciences Shizuoka University

• Tanaka Gengo

  Department Of Geology And Mineralogy Kyoto University

• IKEYA NORIYUKI

  Department of Life and Earth Sciences, Shizuoka University

• Ikeya Noriyuki

  Department Of Life And Earth Sciences Shizuoka University

関連論文

• Migration and speciation of the Loxoconcha japonica species group (Ostracoda) in East Asia
• First discovery of Pravitoceras sigmoidale Yabe from the Yezo Supergroup in Hokkaido, Japan
• Taxonomic evaluation of various morphological characters in the Late Cretaceous desmoceratine polyphyletic genus "Damesites" from the Yezo Group in Hokkaido and Sakhalin
• Kinematics of adductor muscle and pattern formation of various shell ornamentations in marine and brackish water ostracods

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