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Competition between a Pennsylvanian (Late Carboniferous) edrioasteroid and a bryozoan for living space on a brachiopod

Published online by Cambridge University Press:  14 July 2015

James Sprinkle  and
Jeri C. Rodgers
James Sprinkle
Affiliation:
Department of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin, 1 University Station C1100, Austin 78712—0254
Jeri C. Rodgers
Affiliation:
Department of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin, 1 University Station C1100, Austin 78712—0254
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Abstract

We describe a Pennsylvanian (Late Carboniferous) Parapostibulla edrioasteroid that competed for living space with an encrusting cryptostome bryozoan on the brachiopod Composita. the colonial bryozoan grew faster than the solitary edrioasteroid, and the bryozoan increased its colony size by slowly encircling the edrioasteroid. Neither organism was able to overgrow the other, even where the margins became thick, and each had to accommodate the presence and possible defenses of the other. Evidence for defensive measures by edrioasteroids has not previously been reported, but this interaction does emphasize that edrioasteroids could not move away from severe crowding or overgrowth by other organisms.

Type
Paleontological Notes
Information
Journal of Paleontology , Volume 84 , Issue 2 , March 2010 , pp. 356 - 359
Copyright
Copyright © The Paleontological Society 

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