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PORTAIL D'INFORMATION GÉOGRAPHIQUE

Speciation and age revision of the Atacaman snail Bostryx variabilis Herm

Auteur :
CRAIG, A. K.

Description :
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 de document :
Article de périodique

Source :
Quaternary research New York, 1985, vol. 23, n°. 3, p. 382-387, Références bibliographiques : 16 réf.

Date :
1985

Langue :
Anglais
Droits :
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