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Eocene conchostracans from the Laney Member of the Green River Formation, Wyoming, USA

Published online by Cambridge University Press:  20 May 2016

Shen Yan-Bin
Affiliation:
Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences and State Key Laboratory of Paleobiology and Stratigraphy, Nanjing 210008,
Oscar F. Gallego
Affiliation:
Departamento de Biología -Área Ciencias de la Tierra- Paleontología (FACENA- UNNE) y Area Paleontología, (CECOAL-CONICET), Casilla de Correo 128, 3400 Corrientes, Argentina,
H. Paul Buchheim
Affiliation:
Laboratory of LimnoGeology, Department of Earth and Biological Sciences, Loma Linda University, USA,
Roberto E. Biaggi
Affiliation:
Ciencias Naturales-Universidad Adventista del Plata, Entre Rios 03103, Argentina,

Abstract

Two new species of conchostracans, Cyclestherioides wyomingensis and Prolynceus laneyensis, belonging to the Cyclestheriidae and Lynceidae, respectively, are described from the Eocene Laney Member of the Green River Formation of Wyoming, USA. These are the first Cenozoic fossil conchostracans to be formally reported from North America. Cyclestherioides wyomingensis has a close affinity to the extant Cyclestheria hislopi. The latter is a pan-tropical species, found between approximately 30°N and 35°S. Thus, Cyclestherioides may indicate that the Laney Member was deposited in a subtropical setting. The conchostracans and associated fauna of the Laney Member suggest that this member was deposited nearshore in a shallow lake. The concept of Cyclestherioides is emended and some fossil species referred to this genus are revised.

Type
Research Article
Copyright
Copyright © The Paleontological Society 

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