Mucrospirifer prolificus brachiopod from the Silica Shale

After M. mucronatus, the next most common species of Mucrospifier in the Silica Shale (Devonian, Givetian stage) is M. prolificus. It has a somewhat ornate shell exterior like M. mucronatus but the interarea is wider (because the beak of the pedicle valve doesn't curl quite as much). The specimen below comes from Sylvania, OH.

Compare this specimen to M. thedfordensis and M. arkonensis from Arkona, Canada, and Eleutherokomma diluvianoides from Poland