OPISTHOBRANCHIA

Opisthobranchia, subclass Opisthobranchia

(noun) gastropods having the gills when present posterior to the heart and having no operculum: includes sea slugs; sea butterflies; sea hares

Source: WordNet® 3.1

O*pis`tho*bran"chi*a, O*pis`tho*bran`chi*a"ta, n. pl. Etym: [NL., from Gr. (Zoöl.)

Definition: A division of gastropod Mollusca, in which the breathing organs are usually situated behind the heart. It includes the tectibranchs and nudibranchs.

Source: Webster’s Unabridged Dictionary 1913 Edition

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