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Name:
Isorophus cincinnatiensis
Age: Upper Ordovician
Formation: Fairmont Formation
Location: Near Cincinnati, Ohio
Size: Brachiopod is 1.5 inches across
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Here are two very unusual fossil echinoderms. This is a fine pair of edrioasteroids, Isorophus cincinnatiensis, from the Ordovician of Ohio. Edrioasteroids were primitive echinoderms which consisted of a flexible theca composed of numerous polygonal plates. In this specimen, the large edrioasteroids have attached themselves to a brachiopod. This is probably not a symbiotic relationship, nor was the brachiopod under attack - the aragonitic/calcitic shell of the brachiopod merely provided a hard substrate for the edrioasteroids to rest upon. The edrioasteroids have great detail, color, and contrast and are well showcased on the Rafinesquina brachiopod along with two strange bryozoan growths at the bottom. This is a very interesting echinoderm fossil from the Ordovician.
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