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Platystrophia

The shell of Platystrophia is near-rectangular in outline, with strongly convex valves. The shell reaches its maximum width along the hinge line, and the hinge often extends to form sharp "ears" (auricles). A prominent depression (sulcus) is found on the pedicle valve, with a corresponding fold on the brachial valve. The line of junction between the shells is strongly folded at the fron edge. Numerous sharp-crested ribs diverge toward the shell margins. Platystrophia was a medium-size brachiopod. HABITAT Platystrophia was attached by a short pedicle to lime mud and sandy substrates. .