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A New and Open Coiled Valvata (Gastropoda) from the Pliocene Koobi Fora Formation of the Turkana Basin, Northern Kenya

Published online by Cambridge University Press:  20 May 2016

Henning Scholz  and
Matthias Glaubrecht
Henning Scholz
Affiliation:
Museum für Naturkunde - Leibniz Institute for Research in Evolution and Biodiversity at the Humboldt University Berlin, Invalidenstrasse 43, D-10115 Berlin, Germany,
Matthias Glaubrecht
Affiliation:
Museum für Naturkunde - Leibniz Institute for Research in Evolution and Biodiversity at the Humboldt University Berlin, Invalidenstrasse 43, D-10115 Berlin, Germany,
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Abstract

New field collections allow the study and description of Valvata juliae new species from the Pliocene upper Burgi Member of the Koobi Fora Formation of Kenya. The shell morphology of this species varies from trochospiral to planispiral to open coiled. The species is restricted to a short stratigraphic interval. Valvata juliae is considered as an invader of the Turkana Basin during a lacustrine transgression event. The open coiling of the species is interpreted as an ecophenotypic response to a high level of environmental stress caused by lake level fluctuations and emergence of delta systems. These environmental conditions brought Valvata juliae to extinction soon after it invaded the Turkana Basin.

Type
Research Article
Information
Journal of Paleontology , Volume 84 , Issue 5 , September 2010 , pp. 996 - 1002
Copyright
Copyright © The Paleontological Society 

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