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Intercolony fusion suggests polyembryony in Paleozoic fenestrate bryozoans

Published online by Cambridge University Press:  08 February 2016

Frank K. McKinney
Frank K. McKinney*
Affiliation:
Department of Geology, Appalachian State University, Boone, North Carolina 28608, and Research Associate, Field Museum of Natural History, Chicago, Illinois 60605
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Abstract

Fusion occurred between pairs of conspecific colonies of Permian fenestrate bryozoans that were of approximately equal radius at time of contact. In contrast, no fusion occurred in pairs of conspecific colonies that were of unequal radius at time of contact. It is suggested that histologically compatible colonies developed from larvae that settled essentially simultaneously and that the larvae were siblings, lecithotrophic with low mobility, and of the same genotype (i.e., polyembryonic). Thus polyembryony appears to have existed as a reproductive “strategy” for at least 275 Myr, and its scarcity in modern taxa cannot be due to recentness of evolution.

Type
Articles
Information
Paleobiology , Volume 7 , Issue 2 , Spring 1981 , pp. 247 - 251
Copyright
Copyright © The Paleontological Society 

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