Chonetes oklahomensis from Oklahoma

Chonetes genera brachiopods are somewhat common from the Devonian onward and they retain their Strophomenid styling. Below is a specimen of Chonetes oklahomensis from the Fayetteville shale (Carboniferous, Mississippian, Serpukhovian stage), itself a part of the Wewoka formation, of Hughes county, Oklahoma.

Pedicle valve

Anterior

Brachial valve

Posterior

Profile

Here is a group of them together.