Cyrtospirifer whitneyi brachiopod from Iowa

A brachiopod that is well known from the upper Devonian is Cyrtospirifer. Below is a specimen of Cyrtospirifer whitneyi from the Lime Creek formation of Iowa (Devonian, Fransian stage).

Brachial valve

Anterior

Pedicle valve

Posterior

Profile

Several specimens together to show size difference between specimens.

I've found specimens of Cyrtospirifer in the rocks of the Lock Haven formation(PA)/Wiscoy formation(NY) but only as external shell molds in fossil shell hash.