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Patterns of speciation in Jurassic Gryphaea

Published online by Cambridge University Press:  08 April 2016

Anthony Hallam
Anthony Hallam*
Affiliation:
Department of Geological Sciences, University of Birmingham, Birmingham B15 2TT, England
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Abstract

It is shown that the abundant Jurassic oyster Gryphaea provides material adequate to test biogeographic and evolutionary hypotheses involving speciation. Phyletic size increase is widespread if not characteristic and tends to be marked by a sharp initial increase followed by a longer period of stability. The larger size of phyletically younger forms is apparently because of greater age of individuals rather than a higher growth rate. Species durations fall within the range of the majority of Jurassic bivalve species. The detailed study of European Gryphaea indicates a pattern of punctuated equilibria allied with morphological trends, some of which are paedomorphic. Gradualistic, species selection and cladistic models of change are not supported. World-wide analysis of Gryphaea species supports centres of origin and migration rather than vicariance, and a relationship exists between migrational and evolutionary events and changes in the physical environment.

Type
Articles
Information
Paleobiology , Volume 8 , Issue 4 , Fall 1982 , pp. 354 - 366
Copyright
Copyright © The Paleontological Society 

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