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Heterochrony and paedomorphic morphology of Sprinkleocystis ektopios, new genus and species, (Rhombifera, Glyptocystida) from the Middle Ordovician (Caradoc) of Tennessee

Published online by Cambridge University Press:  20 May 2016

Thomas W. Broadhead  and
Colin D. Sumrall
Thomas W. Broadhead
Affiliation:
Department of Geological Sciences, The University of Tennessee, Knoxville, 37996-1410, ,
Colin D. Sumrall
Affiliation:
Department of Geological Sciences, The University of Tennessee, Knoxville, 37996-1410, ,
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Abstract

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.

Type
Research Article
Information
Journal of Paleontology , Volume 77 , Issue 1 , January 2003 , pp. 113 - 120
Copyright
Copyright © The Paleontological Society

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