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Predation and survival among inadunate crinoids

Published online by Cambridge University Press:  08 February 2016

N. Gary Lane
N. Gary Lane*
Affiliation:
Department of Geology, Indiana University, Bloomington, Indiana 47405
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Abstract

The proposition is presented that the large thecae of many Paleozoic crinoids housed gonads, unlike modern crinoids that have the gonads on the arms or pinnules. Early in their history, inadunate crinoid gonads migrated into a voluminous anal sac, effectively separating them from other vital organs. Excision of the sac by predatory fishes and cephalopods would have been less traumatic than an attack on the theca, and the sac could be more readily regenerated. The pores and slits between plates on inadunate sacs are interpreted as gonopores. Some anal sacs may also have served as brood chambers. The traditional explanation of the sac as a special respiratory structure is discounted.

Type
Articles
Information
Paleobiology , Volume 10 , Issue 4 , Fall 1984 , pp. 453 - 458
Copyright
Copyright © The Paleontological Society 

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