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Ontogeny and heterochrony in the ostracode Cavellina Coryell from Lower Permian rocks in Kansas

Published online by Cambridge University Press:  08 April 2016

Peter N. Schweitzer
Affiliation:
Woods Hole Oceanographic Institution/Massachusetts Institute of Technology Joint Program in Oceanography, Woods Hole, Massachusetts 02543
Roger L. Kaesler
Affiliation:
Department of Geology, University of Kansas, Lawrence, Kansas 66045
G. P. Lohmann
Affiliation:
Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543

Abstract

Animals evolve by changing their form and by changing the rate at which they develop. Since evolution of development through time may be directly related to the adaptation of their life histories, study of ontogeny in fossils may yield information about the ecology of extinct animals. We need to know how to measure animals' ontogeny and at what taxonomic level structural differences overshadow differences in development. Two closely related species of the Permian ostracode Cavellina were compared to determine how much of the morphological difference between them is due to differences in their ontogenies. Most of the difference is not related to ontogeny. They also differ in a way that could be explained by heterochrony, although this difference is secondary in importance to the structural difference. These findings suggest that ecological adaptation might best be studied by examining the changes in development that occur within species through time and space.

Type
Articles
Copyright
Copyright © The Paleontological Society 

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