Terebratula is a modern genus of brachiopod with a fossil record dating back to the Late Devonian. These brachiopods are stationary epifaunal suspension feeders and have a worldwide distribution.
Terebratula species have biconvex egg-shaped shells, anterior margins of the valves have two small folds, concentric growth lines are quite thin or nearly absent. The larger valve has a ventral umbo with the opening through which they extend a short peduncle
From https://en.wikipedia.org/wiki/Terebratula
Members of the phylum Brachiopoda resemble Bivalves in having two shells but fossil bivalves can be distinguished by having identical valves, while the two Brachiopod valves are bilaterally symmetrical and are of different size.Brachiopods were common from the early Cambrian until the end Permian but are rare today. Brachiopods have been used as index fossils for the Ordovician, Silurian, Carboniferous and Cretaceous.
From http://www.kgg.org.uk/terebratulah.html
The brachiopod Terebratula ampulla, shown in the pictures, comes from Cyprus
Photos Nicosia by George Konstantinou
Hello. Terebratula sensu stricto is not a modern genus, and it does not date back to the Devonian. Wikipedia is wrong about this topic.Terebratula sensu stricto is safely recorded from the Miocene to the Pleistocene (Calabrian) of the Mediterranean region, and Paratethys. What is the age of the specimens depicted? They remind me of early Pliocene specimens of T. calabra. Greetings!
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