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The role of phyletic change in the evolution of Pseudocubus vema (Radiolaria)

Published online by Cambridge University Press:  25 May 2016

Davida E. Kellogg
Davida E. Kellogg*
Affiliation:
Department of Geology, University of Maine at Orono, Orono, Maine 04473
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Abstract

While the importance of allopatric speciation in the fossil record has long been underestimated, phyletic change within single unbranching lineages also occurs. The 50% increase in thoracic width observed in the radiolarian species Pseudocubus vema from an Antarctic deep-sea core is a clear example of a long-term phyletic trend in a continuous fossil sequence. Phyletic change in P. vema occurred at varying rates, but changes in the morphologic rate of evolution do not correspond to any obvious breaks in the fossil record such as would be indicated by missing segments of the core's magnetic stratigraphy. Variation in thoracic width, as measured by the coefficient of variation, does not depend on the morphologic rate of evolution, proportional rate of evolution, nor the amount of time required for the width to change by one standard deviation, so much as it depends on whether change was accomplished by addition or removal of extreme phenotypes to or from the population.

Type
Research Article
Information
Paleobiology , Volume 1 , Issue 4 , Fall 1975 , pp. 359 - 370
Copyright
Copyright © The Paleontological Society 

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