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Speciation and Age Revision of the Atacaman Snail Bostryx variabilis Herm

Published online by Cambridge University Press:  20 January 2017

Alan K. Craig
Alan K. Craig*
Affiliation:
Department of Geography, Florida Atlantic University, Boca Raton, Florida 33431 USA
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Abstract

Field evidence from the Atacama Desert of northern Chile indicates that the stratigraphic position of the land snail Bostryx variabilis Herm has been incorrectly assigned to a marine series of the lower Pleistocene. Isotopic dating proves that the snail is a recently extinct Holocene taxon requiring no special paleoenvironmental explanations for its presence. However, the snail appears to offer an example of stress-induced speciation in confirmation of the “punctuated equilibrium” theory of evolution. It was probably transported from a fog oasis mountain habitat to a lower, hyperarid hostile environment by a sudden mudflow.

Type
Original Articles
Information
Quaternary Research , Volume 23 , Issue 3 , May 1985 , pp. 382 - 387
Copyright
University of Washington

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