Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

Journal of Paleontology

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Web of Science (1) Citing Articles via Google Scholar Google Scholar Articles by BROADHEAD, T. W. Articles by SUMRALL, C. D. Search for Related Content GeoRef GeoRef Citation

HETEROCHRONY AND PAEDOMORPHIC MORPHOLOGY OF SPRINKLEOCYSTIS EKTOPIOS, NEW GENUS AND SPECIES, (RHOMBIFERA, GLYPTOCYSTIDA) FROM THE MIDDLE ORDOVICIAN (CARADOC) OF TENNESSEE

¹ Department of Geological Sciences, The University of Tennessee, Knoxville, 37996-1410, <twbroadhead{at}utk.edu>, <csumrall{at}utk.edu>

The glyptocystitoid rhombiferan Sprinkleocystis ektopios new genus and species is described from the Middle Ordovician (Caradoc) Benbolt Formation of Tennessee. This species is characterized by having four ambulacra bearing only terminal brachioles, the absence of lateral 5, and protuberant pectinirhombs and periproct. Many of its features are considered typical of the family Cheirocrinidae whereas others are more characteristic of the Glyptocystitidae. Its small size and simple ambulacral and pectinirhomb structures suggest a paedomorphic evolutionary origin, and its thecal morphology further suggests that the validity of a separate Cheirocrinidae and Glyptocystitidae may need reevaluation.

This article has been cited by other articles:

				C. D. Sumrall and G. A. Wray Ontogeny in the fossil record: diversification of body plans and the evolution of "aberrant" symmetry in Paleozoic echinoderms Paleobiology, January 1, 2007; 33(1): 149 - 163. [Abstract] [Full Text] [PDF]