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Any of several groups of bivalveshellfish with elongated, asymmetrical shells
fresh water mussels, usually edible, of the order Unionida in subclass Lua error in Module:parameters at line 780: Parameter "noshow" is not used by this template..
salt water mussels, usually edible, of the order Mytilida in subclass Pteriomorphia.
Certain other bivalves of somewhat similar appearance, such as the zebra mussel and quagga mussel of the family Lua error in Module:parameters at line 780: Parameter "noshow" is not used by this template. in subclass Heterodonta.