Heteromyaria

• (n. pl.) A division of bivalve shells, including the marine mussels, in which the two adductor muscles are very unequal. See Dreissena, and Illust. under Byssus.
Found on http://thinkexist.com/dictionary/meaning/heteromyaria/

Heteromyaria

Het`e·ro·my·a'ri·a noun plural [ New Latin , from Greek ... other + ... a muscle.] (Zoology) A division of bivalve shells, including the marine mussels, in which the two adductor muscles are very unequal. See Dreissena , and Illust. under Byssus .
Found on http://www.encyclo.co.uk/webster/H/40
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