Origin of inequivalve
Examples from the Web for inequivalve
In the former, all the shells are inequivalve; in the latter equivalve.A Conchological Manual|George Brettingham Sowerby
Asymmetrical, inequivalve, fixed, with extensive pallial sutures; no siphons.
A bivalve is said to be equivalve when the two shells composing it are of the same size, inequivalve when they are not.Sea-Weeds, Shells and Fossils|Peter Gray