monomyarian
From ZooTerms (Dictionary of Invertebrate Zoology)
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
