n. plIsopleura(Zoöl) A subclass of Gastropoda, in which the body is symmetrical, the right and left sides being equal.☞ The intestine terminates at the posterior end of the body, and the gills and circulatory and reproductive organs are paired. It includes the chitons (Polyplacophora), together with Neomenia and Chætoderma, which are wormlike forms without a shell.
Century Dictionary and Cyclopedia
isopleuraA prime division of gastropods containing those which are equalsided or bilaterally symmetrical: contrasted with Anisopleura. The isopleural gastropods are chiefly represented by the chitons, but also include such worm-like forms as Chætoderma and Neomenia. Ranked as a superorder, the Isopleura have been divided into three orders, Polyplacophora, Chætodermæ, and Neomenoidea.