Fossil specimen of the edrioasteroid *Isorophus cincinnatiensis* attached to the brachiopod *Rafinesquina alternata*; from the Ordovician of Ohio (PRI 76783). Specimen is from the collections of the [Paleontological Research Institution](http://www.priweb.org), Ithaca, New York. Width of brachiopod is 4 cm. Model by Emily Hauf.