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Journal of Paleontology

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A New Species of the Dual-mouthed Paracrinoid Bistomiacystis and a Redescription of the Edrioasteroid Edrioaster priscus from the Upper Ordovician Curdsville Member of the Lexington Limestone

¹ Department of Earth and Planetary Sciences, University of Tennessee, Knoxville 37996-1410, <csumrall@utk.edu>
² Department of Geology, University of Cincinnati, Cincinnati Ohio, 45221, <delinebl@email.uc.edu>

The first 20% of the full text of this article appears below.

	INTRODUCTION

 
ECHINODERMS ARE important faunal components in the Curdsville Member of the Lexington Limestone. Numerous clades are represented, including Crinoidea (Springer, 1911; Parsley, 1981), Paracrinoidea (Parsley and Mintz, 1975; Parsley, 1981), Cyclocystoidea (undescribed), Edrioasteroidea (Miller and Gurley, 1894; Bell, 1976, 1979), and Stylophora (Parsley, 1981, 1991). Although some of these taxa are well preserved (Springer, 1911), most have been recovered from residues of acidized samples. These later specimens are poorly preserved, obscuring much of the information. Here we describe well preserved specimens recently collected by members of the Kentucky Paleontological Society (Lexington) of two species that add significantly to our understanding of lesser known components of the Curdsville Fauna. Bistomiacystis schrantzi n. sp. is a large paracrinoid bearing two separate ambulacral systems that lead to two peristomial openings. Our research suggests that this unusual arrangement is consistent with oral areas of other derived blastozoans bearing oral plates. Edrioaster priscus (Miller and Gurley) is a poorly known large edrioasterid edrioasteroid previously known only from specimens preserved in coarse beekite. The new material of this taxon allows for a thorough characterization of this poorly known edrioasteroid and shows that previous assessments of its size and morphology need revision.

All specimens in this study were collected from a single outcrop of the Curdsville Member of the Lexington Limestone near Danville, Garrard County, central Kentucky. The Curdsville Member of the Lexington Limestone consists of bioclastic calcarenite interbedded with thin pockets of shale. The calcarenite units are crossbedded, forming small bars indicative of a high energy, though variable, shoal environment. Unabraded echinoderms and other fossils are preserved in the mud pockets that accumulated in topographic lows between bars (Cressman, 1973). One of the edrioasteroids was attached directly to . . . [Full Text of this Article]

This article has been cited by other articles:

				C. D. SUMRALL, C. E. BRETT, T. A. DEXTER, and A. BARTHOLOMEW AN ENIGMATIC BLASTOZOAN ECHINODERM FAUNA FROM CENTRAL KENTUCKY Journal of Paleontology, September 1, 2009; 83(5): 739 - 749. [Abstract] [Full Text] [PDF]