Carditidae have strong elongate to oval or round shells with strong radiating ribs that may be intersected by concentric scales or ribs. Margins are usually scalloped or toothed. They often attach to substrate using byssal threads. They are unique in that many brood their eggs inside their shells between the inner and outer branches of the gills.

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Cardita crassicosta (large-ribbed cardita)
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Cardita crassicosta (large-ribbed cardita)

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