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RASTRITES

RASTRITES The brachial valve of this genus is more convex than the pedicle valve and has a broad, shallow fold. The pedicle valve has a small depression and a slight, curved-in-beak. The commissure is often slightly deflected toward the brachial valve. The ornament consists of numerous fine rounded ribs, and prominent, concentric growth lines commonly forming frills on both valves. HABITAT Atrypa lived in shallow water on soft substrates. .