An Illustrated and Cross-Referenced Glossary of
Malacological and Conchological Terms

by Paul S. Mikkelsen

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Term Definition

ANISOMYARIAN   The condition, in bivalve molluscs, of having adductor muscle scars of unequal size, with the posterior one usually being the larger of the two; see also: MONOMYARIAN; DIMYARIAN; HETEROMYARIAN.

ISOMYARIAN   Descriptive of a bivalve shell having two adductor muscle scars on the inner surface which are approximately equal in size; = HOMOMYARIAN.

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