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The systematics and ontogeny of Pyrgopostibulla belli, a new edrioasteroid (Echinodermata) from the Lower Devonian of New York

Published online by Cambridge University Press:  20 May 2016

Colin D. Sumrall ,
Carlton E. Brett  and
Sean R. Cornell
Colin D. Sumrall
Affiliation:
Department of Earth and Planetary Sciences, University of Tennessee, Knoxville 37996-1410,
Carlton E. Brett
Affiliation:
Department of Geology, University of Cincinnati, Ohio 45221-0013
Sean R. Cornell
Affiliation:
Department of Geology, St. Lawrence University, Brown Hall, Canton, New York 13617-1410
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Extract

Postibullinid edrioasteroids are a small clade of discoidal edrioasteroids that are locally common members of Devonian to Pennsylvanian, shallow marine, hard substrate faunas in North America and Europe. A small discoidal theca, narrow, highly elevated ambulacral cover plates, a highly elevated anal pyramid, and in many forms a posterior oral protuberance characterize this clade (Bell, 1976b; Sumrall et al., 2000). Here we describe the oldest known postibullinid, Pyrgopostibulla belli n. gen. and sp., a species that differs from other postibullinids by having a well-developed pedunculate zone and a complex, five-plate pattern of ambulacral cover plates. A dense population of these edrioasteroids preserved at a single stratigraphic horizon provides a census sample of individuals that were killed as a part of a final and abrupt burial pulse on this Lower Devonian hardground (Cornell et al., 2003). As such, this case study provides insight into the ontogeny and colonization strategies of isorophinid edrioasteroids.

Type
Paleontological Notes
Information
Journal of Paleontology , Volume 80 , Issue 1 , January 2006 , pp. 187 - 192
Copyright
Copyright © The Paleontological Society 

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