Large adductor muscle - Holds the shells tightly together to prevent drying out, Strong shell - Protect against breakage in high energy environment, Small pallial sinus - Indicates short siphons which are retractable, Smooth unornamented shell - Moves easily through the sediment, Large pallial sinus - Indicates long siphons , Elongate shell - Moves easily up and down in burrow, Gapes - Siphons cannot be retracted and are permanently out for feeding and respiration.,

Bivalve morphology and Function

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