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Pentamerus

Pentamerus In this relatively large brachiopod, both pedicle and brachial valves are convex and often tongue shaped in outline. The pedicle valve umbo (apex area) is stout and curved strongly backward, with a prominent middle partition (septum). Two prominent near-parallel septa are found on the brachial valve. The shell exterior is smooth, with fine growth lines. HABITAT Pentamerus is very common in shallow-water limestones, often forming shell banks. The pedicle was not functional in adults, so they lived umbones downward on silty and muddy substrates. .