Small to medium size, thin, rather flat, triangular shell. Right valve more convex than the other. Both valves have about 8~10 distinct ribs or rather folds with deep and wide interstices. Ribs of some shells somewhat angular, in others more rounded. Ribs carry thron-like curled scales at regular distances. Entire shell covered with fine radial threads, sometimes worn but usually distinct near margins. Ears, small and equal, carry these thorn-like scales on the very top.
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