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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 is a very unusual fossil echinoderm. This is a fine edrioasteroid, 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 edrioasteroid has attached itself 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 edrioasteroid to rest upon. The edrioasteroid has great detail color and contrast and is well showcased on the Rafinesquina brachiopod along with two strang bryozoan growths at the bottom. This is a very interesting fossil from the Ordovician.
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