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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