Family Corbiculidae - marsh clams

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Bivalvia
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  Environment
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Fresh : No | Brackish : No | Marine : Yes
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Synonym of Cyrenidae (Ref. 3477). Shell equivalve, solid to very thick, rounded to subtrigonal in outline, generally not gaping. Umbones prosogyrate, nearly at or in front of the midline of valves. No lunule or escutcheon. Sculpture, when developed, mainly concentric. Periostracum conspicuous, often fibrous. Ligament external, a thick arched band behind the umbones. Hinge with 3 diverging cardinal teeth in each valve, and strong anterior and posterior lateral teeth which may be transversally striate. Interior of shell porcelaneous. Two subequal, rounded adductor muscle scars. Pallial sinus reduced or absent. Internal margins smooth. Gills of eulamellibranchiate type, fused to each other behind the foot; outer demibranch with or without an expansion above the axis. Foot generally grooved and hatchet-shaped. Mantle broadly open ventrally. Siphons short. Suspension filter feeders, burrowing in soft bottoms of shallow fresh or brackish water areas. Sexes separate. Used locally for subsistence (Ref. 348).
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Ref.
[ e.g. 9948]                       
Glossary
                    [ e.g. cephalopods]