Tenticospirifer brachiopod from Iowa

Tenticospirifer is a triangular shaped brachiopod that reminds me of Cyrtina a lot. These specimens came from the Lime Creek formation (Devonian, Fransian stage) near Rockford, Iowa. The planar shape of the posterior indicates that these brachs likely lay flat on the seafloor or other surface and just flopped the brachial valve open to feed.

Specimen #1

Brachial valve

Anterior

Pedicle valve

Posterior

Profile

Specimen #2

Brachial valve

Anterior

Pedicle valve

Posterior

Profile

I purchased these specimens from an auction on E-bay.