A New Species of Aurila (Crustacea: Ostracoda: Cytheroidea: Hemicytheridae) from the Pleistocene Omma Formation on the Coast of the Sea of Japan
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概要
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The ostracod genus Aurila is distributed worldwide in shallow marine areas, and fossils of this genus are commonly found in the Late Cenozoic strata of Japan. We describe a new species of Aurila, A. tsukawakii, from the coast of the Sea of Japan in the Lower Pleistocene Omma Formation, Toyama Prefecture, central Japan. Its geological and geographical occurrence suggests that this species originated in the Late Pliocene within the semi-closed Sea of Japan around 3 Ma as an endemic species and likely went extinct by the Middle Pleistocene (ca. 0.4 Ma) at the latest. Another related species of Aurila, Aurila sp., appeared in the Sea of Japan during the Late Pleistocene (ca. 0.1 Ma) at the latest, and continues to inhabit the Sea of Japan along the Japanese coast today. We briefly discuss the ecology, biogeography, and distributional pattern of normal pores in the median area of the carapace of these two species.
- 2009-04-30
著者
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Kamiya Takahiro
School Of Natural System College Of Science And Engineering Kanazawa University
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Ozawa Hirokazu
Department Of Geology National Museum Of Nature And Science
関連論文
- Water temperature, salinity ranges and ecological significance of the three families of Recent cold-water ostracods in and around the Japan Sea
- Early Pleistocene ostracods from the Hamada Formation in the Shimokita Peninsula, northeastern Japan : the palaeo-biogeographic significance of their occurrence for the shallow-water fauna
- A New Species of Aurila (Crustacea: Ostracoda: Cytheroidea: Hemicytheridae) from the Pleistocene Omma Formation on the Coast of the Sea of Japan
- Middle Pleistocene ostracods from the Naganuma Formation, Sagami Group, central Japan : significance of the occurrence for the bay fauna along the Northwest Pacific margin
- 日本海南縁および東縁部の寒冷性介形虫化石
- Japan Sea ostracod assemblages in surface sediments : their distribution and relationships to water mass properties