A new agelacrinitid edrioasteroid, Multiplexidiscus mckenziensis n. gen., n. sp. is described from the middle Silurian upper McKenzie Shale Member of the Mifflintown Formation of Pennsylvania. These edrioasteroids were attached to a large hardground clast that was reworked and flipped during a storm event. The occurrence of edrioasteroids in a near shore, perhaps in sub-normal salinity, is unusual for echinoderms. The edrioasteroids show a dispersed spatial distribution and weak thecal orientation. Multiplexidiscus differs from other agelacrinid edrioasteroids in the presence of a complex pattern of ambulacral cover plates combined with nearly straight paedomorphic ambulacra.
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1 September 2009
A New Agelacrinitid Edrioasteroid Attached to a Large Hardground Clast from the McKenzie Member of the Mifflintown Member (Silurian) of Pennsylvania
Colin D. Sumrall,
Carlton E. Brett,
Michael L. McKinney
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Edrioasteroidea
McKenzie
Mifflintown
New York
Silurian