This is the strophomenid brachiopod Clitambonites squamatus, from the Aseri stage of the middle Ordovician (Darriwillian stage of the ICS) rocks near St. Petersburg, Russia. It comes from the Koporie quarry.
Brachial valve
Anterior
Pedicle valve
Posterior
Profile
I am basing some of my information from this record on the Baltoscandian fossils website.
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