Stegerhynchus lewissi brachiopod from the Wenlock Fm.

This tiny brachiopod is Stegerhynchus lewissi from the Silurian aged (Wenloch epoch, Sheinwoodian to Homerian stage) Wenlock formation, near Dudley, England. It's a rhynchonellid type brachiopod as evidenced by the lack of a wide hinge line, a protruding, beak-like Umbo and coarse plication. This specimen has a very shallow but wide sulcus and is generally rectangular in shape. Compare this miniscule species with the giant Stegerhynchus stricklandi from the Waldron shale.

Brachial valve

Anterior

Pedicle valve

Posterior

Profile