From ZooTerms (Dictionary of Invertebrate Zoology)
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monomyarian (adjective; Greek monos, one; mys, muscle): 1. Having only one muscle.

2. (Mollusca: Bivalvia) In oysters and scallops, pertaining to the anterior adductor muscle that has completely disappeared, and the posterior adductor shifted to a more central location between the valves; monomyarian condition.

See also: anisomyarian