Skip to content Skip to navigation

Article: Parasitism of Ordovician bryozoans and the origin of pseudoborings

Publication: Palaeontology
Volume: 31
Part: 4
Publication Date: December 1988
Page(s): 939 949
Author(s): T. J. Palmer and M. A. Wilson
Addition Information

How to Cite

PALMER, T. J., WILSON, M. A. 1988. Parasitism of Ordovician bryozoans and the origin of pseudoborings. Palaeontology31, 4, 939–949.

Online Version Hosted By

The Palaeontological Association (Free Access)


Upper Ordovician trepostome bryozoans from the vicinity of Cincinnati, Ohio, USA, contain trace fossils that resulted from the overgrowth by the bryozoan of soft-bodied parasites that settled on the living colony. The resulting structures (pseudoborings) superficially resemble borings, and the term 'bioclaustration' is introduced to describe the process. The pseudoboring consists of groups or rows of sub-circular pits, connected by tunnels that were formed by the roofing-over of adventitious stolons by localized bryozoan growth. The structure reflects the external morphology of the parasite, and is named Catellocaula vallata ichnogen. and ichnosp. nov. A hydroid or colonial ascidiacian tunicate is suggested as the perpetrator.
PalAss Go! URL: | Twitter: Share on Twitter | Facebook: Share on Facebook | Google+: Share on Google+