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Journal of Paleontology

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TWO LATE ORDOVICIAN ASTEROIDS (ECHINODERMATA) WITH CHARACTERS SUGGESTIVE OF EARLY OPHIUROIDS

¹ Department of Geology, University of Illinois, Urbana 61801, <dblake{at}uiuc.edu>

Jugiaster n. gen. is based on the Upper Ordovician asteroid (Echinodermata) Petraster speciosus; in addition, a second Upper Ordovician occurrence, Phyrtosaster casteri, new gen. and sp., is described. Both species exhibit mouth frame characters suggestive of those long considered typical of early ophiuroids, thereby demonstrating the adaptive versatility and complexity of asterozoan diversification. Jugiaster specimens also exhibit delicate ambulacral column articulation. The new fossils indicate the need for much further study before early asterozoan history will be well understood.

This article has been cited by other articles:

				D. B. Blake and F. R. Ettensohn The Complex Morphology of a New Lower Silurian Asteroid (Echinodermata) Journal of Paleontology, January 1, 2009; 83(1): 63 - 69. [Abstract] [Full Text] [PDF]

				D. B. Blake A New Ordovician Asteroid (Echinodermata) with Somasteroid-like Skeletal Elements Journal of Paleontology, July 1, 2008; 82(4): 645 - 656. [Abstract] [Full Text] [PDF]