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Cyrtina

The shell of this small to medium-size spieiferid has a characteristic caplike shape and maxmum width along the hinge line. On the pedicle valve there is a large triangular interareas, with a large hole for the pedicle near the apex and a prominent sulcus that widens toward the fron. The brachial valve is weakly convex, with an unornamented fold and depression. Several distinc ribs on both valves produce an undulating comminent near the front margins. HABITAT Cyrtina lived in soft sedments. .