Wikipedia
Meristella
Meristella is a genus of brachiopod found from the Upper Silurian to the Middle Devonian characterized by a smooth oval shell and a prominent incurved beak on the pedicle valve. Meristella is placed in the family Meristellidae of the articulate brachiopod order Athyridida.
Related genera include Charionella, Meristelloides, and Pentagonia.