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Taxonomy and palaeobiogeographical significance of four new species of Semicytherura (Ostracoda, Crustacea) from the early Pleistocene Omma Formation of the Japan Sea coast

Hirokazu Ozawa and Takahiro Kamiya
Taxonomy and palaeobiogeographical significance of four new species of Semicytherura (Ostracoda, Crustacea) from the early Pleistocene Omma Formation of the Japan Sea coast
Journal of Micropalaeontology (November 2008) 27, Part 2: 135-146

Abstract

The genus Semicytherura (Ostracoda, Crustacea) is distributed widely in shallow-sea areas of the Northern Hemisphere and occurs commonly in Pliocene and Pleistocene strata along the Japan Sea coasts. Four new species--Semicytherura robustundata sp. nov., Semicytherura subslipperi sp. nov., Semicytherura leptosubundata sp. nov. and Semicytherura tanimurai sp. nov.--are described from the Early Pleistocene Omma Formation, central Japan. These species are palaeobiogeographically significant in the history of species diversity changes in Japan Sea benthic fauna during the Late Cenozoic. The geological and geographical occurrences suggest that these four species originated within the Japan Sea from the Late Pliocene, including one species that diversified by heterochronic evolution, and were endemic to the Japan Sea. They became extinct within this sea during the Early Pleistocene. J. Micropalaentol. 27(2): 135-146, November 2008.


ISSN: 0262-821X
EISSN: 2041-4978
Serial Title: Journal of Micropalaeontology
Serial Volume: 27, Part 2
Title: Taxonomy and palaeobiogeographical significance of four new species of Semicytherura (Ostracoda, Crustacea) from the early Pleistocene Omma Formation of the Japan Sea coast
Affiliation: National Museum of Nature and Science, Department of Geology, Tokyo, Japan
Pages: 135-146
Published: 200811
Text Language: English
Publisher: British Micropalaeontological Society, London, United Kingdom
References: 41
Accession Number: 2009-059226
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 plates, sketch map
N36°40'60" - N36°40'60", E136°52'00" - E136°52'00"
Secondary Affiliation: Kanazawa University, JPN, Japan
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 200932
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