Acanthospondylus pennsylvanicus, new genus and species, is described and illustrated on the basis of a single specimen from the Conemaugh Group (Late Pennsylvanian) of western Pennsylvania. Distribution and morphology of ossicles similar to those of Eospondylus primigenius Stürtz, 1886, from the Early Devonian of Germany, including the absence of radial shields, dorsal and ventral arm plates, and the relatively wide separation of laterals over the ambulacral groove, indicates that Acanthospondylus belongs to the family Eospondylidae (Oegophiurida, Zeugophiurina) along with Eospondylus Gregory, 1897, and Kentrospondylus Lehmann, 1957. This extends the range of Eospondylidae from Early Devonian (Siegenian and Emsian) to Late Pennsylvanian (Early Kasimovian [Missourian]).
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Vol. 82 • No. 3