The Recent rhynchonellide brachiopod Parasphenarina cavernicola gen. et sp. nov. from the submarine caves of Okinawa, Japan

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概要

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• A new micromorphic rhynchonellide brachiopod Parasphenarina cavernicola gen. et sp. nov. is described from submarine caves on the outer slopes of coral reefs in the ryukyu Islands, Japan. Based on the presence of spinuliform crura, the new genus is included in the Family Frieleiidae Cooper, the diagnosis of which is emended. Detailed morphological observations of different-sized shells and intraspecific variability have shown that the morphology of the hinge plates changes considerably during ontogeny. It is suggested that the new genus Parasphenarina could have evolved from forms close to the extremely rare bathyal Pliocene genus Sphenarina Cooper. The diagnostic characteristics of Parasphenarina such as diminutive adult size and lack of septalium and median septum may represent paedomorphic evolution.

• 日本古生物学会の論文
• 2002-09-30

著者

• Endo Kazuyoshi

  Institute Of Geoscience The University Of Tsukuba

• MOTCHUROVA-DEKOVA NEDA

  National Museum of Natural History

• SAITO MICHIKO

  Department of Earth and Planetary Sciences, University of Tokyo

• Saito Michiko

  Department Of Earth And Planetary Science University Of Tokyo

• Saito Michiko

  Department Of Earth And Planetary Sciences University Of Tokyo

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