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A new species of Cythere (Ostracoda) from the Middle Eocene McIntosh Formation, Doty Hills, Washington State, USA, and its significance for the evolutionary history of the genus

Published online by Cambridge University Press:  20 May 2016

Tatsuhiko Yamaguchi  and
James L. Goedert
Tatsuhiko Yamaguchi
Affiliation:
Postdoctoral Fellowship for Research Abroad, Japan Society for the Promotion of Science/Scripps Institution of Oceanography, University of California, San Diego; 206 Vaughan Hall, MS-0244, La Jolla, California 92093-0244, USA, ,
James L. Goedert
Affiliation:
Burke Museum of Natural History and Culture, University of Washington, Box 353010, Seattle, Washington 98195, USA,
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Abstract

Cythere ikeyanoriyukii n. sp., an extant phytal ostracode genus, was obtained from the Middle Eocene McIntosh Formation in the Doty Hills, western Washington State, USA. It was associated with eleven taxa, which are extant phytal and shelfal genera such as Loxocorniculum, Xestoleberis, Ambostracon, Coquimba, and Acanthocythereis. The presence of Cythere in this assemblage is surprising and indicates that the first appearance of this genus was middle Eocene time at the latest, or at least 20 Ma earlier than previously thought. Cythere did not originate in the Pacific Ocean around Japan as previously thought, but instead must have migrated from the northeastern Pacific to the northwestern Pacific between middle Eocene and early Miocene time.

Type
Research Article
Information
Journal of Paleontology , Volume 84 , Issue 4 , July 2010 , pp. 709 - 719
Copyright
Copyright © The Paleontological Society

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