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...
THE SYSTEMATICS AND ONTOGENY OF PYRGOPOSTIBULLA BELLI, A NEW EDRIOASTEROID (ECHINODERMATA) FROM THE LOWER DEVONIAN OF NEW YORK
COLIN D. SUMRALL, CARLTON E. BRETT, SEAN R. CORNELL; THE SYSTEMATICS AND ONTOGENY OF PYRGOPOSTIBULLA BELLI, A NEW EDRIOASTEROID (ECHINODERMATA) FROM THE LOWER DEVONIAN OF NEW YORK. Journal of Paleontology ; 80 (1): 187–192. doi: https://doi.org/10.1666/0022-3360(2006)080[0187:TSAOOP]2.0.CO;2
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