Notes on non-marine bivalve Trigonioides (Trigonioides?) from the mid-Cretaceous Goshoura Group, Kyushu, Japan |
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Authors: | Toshifumi Komatsu Chen Jinhua Hiroaki Ugai Koji Hirose |
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Institution: | aDepartment of Earth Science, Kumamoto University, Kurokami 2-39-1, Kumamoto 860-8555, Japan;bNanjing Institute of Geology and Palaeontology, Chinese Academy of Science, Nanjing 210008, China;cGoshoura Cretaceous Museum, Goshoura 4310-5, Amakusa, Kumamoto 866-0321, Japan |
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Abstract: | Trigonioides goshourensis n. sp. and Trigonioides amakusensis Kikuchi and Tashiro occur in the late Albian Eboshi Formation of the Goshoura Group in Kyushu, Japan. These Albian species are characterized by three radial pseudocardinal teeth on the thick and wide hinge plate, and are probably ancestors of Cenomanian species of Trigonioides (Kumamotoa) with four radial pseudocardinal teeth. This chronological relation may be important for the correlation of non-marine Cretaceous strata in East Asia. In addition, the habitat of T. amakusensis is interpreted as estuarine tidal flats under brackish water conditions, although Trigonioides is generally a freshwater bivalve genus. |
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Keywords: | Cretaceous Goshoura group Non-marine bivalves Trigonioides |
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