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A NEW AND OPEN COILED VALVATA (GASTROPODA) FROM THE PLIOCENE KOOBI FORA FORMATION OF THE TURKANA BASIN, NORTHERN KENYA

HENNING SCHOLZ and MATTHIAS GLAUBRECHT
Journal of Paleontology
Vol. 84, No. 5 (SEPTEMBER 2010), pp. 996-1002
Published by: Paleontological Society
Stable URL: http://www.jstor.org/stable/40802063
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
A NEW AND OPEN COILED VALVATA (GASTROPODA) FROM THE PLIOCENE KOOBI FORA FORMATION OF THE TURKANA BASIN, NORTHERN KENYA
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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 stratigraphie 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.

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