Aequipecten glyptus (A.E. Verrill, 1882) measures up to 75 mm (about 3 inches) in height. The Red-ribbed Scallop is found along the Eastern Seaboard of the US, from Cape Cod to Texas. It is a moderately deep-water species, usually living in depths from 130 to 860 m (about 430 to 2,820 ft). The thin, flattened shell bears typical, red-colored, relatively broad ribs. The internal surface of valves shows narrow ribs that may serve to reinforce the shell. (A large reproduction of the illustration below is on display at the In Focus exhibition at the National Shell Museum.)
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