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Diversification and germ-line determination

Published online by Cambridge University Press:  08 February 2016

Leo W. Buss
Leo W. Buss*
Affiliation:
Department of Biology, Yale University, New Haven, Connecticut 06511
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Abstract

The species richness of extant metazoan phyla displays a strong association with the ontogenetic timing of germ-line determination. Taxa with early ontogenetic determination of the germ-line are characterized by low species number relative to taxa with late or variable determination. A test for a similar association in fossil taxa is compromised by the fact that all phyla displaying early determination of the germ-line are small, soft-bodied groups which lack a reliable fossil record. To the extent that this correlation reflects causality, patterns of evolutionary diversification have been decidedly non-random. The fact that ontogenetic timing of germ-line determination defines the extent to which genetic variation arising during the course of ontogeny may be inherited suggests a possible causal foundation for the pattern.

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Paleobiology , Volume 14 , Issue 4 , Fall 1988 , pp. 313 - 321
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Copyright © The Paleontological Society 

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References

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