Sowerbyella rugosa

Sowerbyella rugosa, a small brachiopod from the Edendian. Outside of brachial valve (left) and pedicle valve (right).

Source: Pope, J.K and W.D. Martin. 1979. Field Guidebook to the Biostratigraphy and Paleoenvironments of the Cincinnatian Series of Southeastern Indiana. Seventh Annual Field Conference of the Great Lakes Section, Society of Economica Paleontologists and Mineralogists. Miami University Audio Visual Service: Oxford, Ohio.