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Name:
Isorophus cincinnatiensis
Age: Ordovician
Formation: Fairview Formation
Location: Clermont County, Ohio
Size: Edrioasteroid is 0.9 inches across
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Here is an unusual fossil echinoderm. This is a large 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. This edrioasteroid/brachiopod specimen has good color and contrast and is well centered on the rectangular plate of limestone. This is an interesting example of this unique echinoderm.
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