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Large Edrioasteroid Attached to Brachiopod
INDIVIDUAL FOSSILS • OTHER ECHINODERMS
Stock Number Z511092
Too Cheap!

Name:   Isorophus cincinnatiensis
Age:  Upper Ordovician
Formation:  Fairmont Formation
Location:  Near Cincinnati, Ohio
Size:  Brachiopod is 1.15 inches across
Price:  $24.00

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 large edrioasteroid has great detail, color, and contrast and is well showcased on the Rafinesquina brachiopod. This is a very interesting fossil from the Ordovician.