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Opisthobranchiate :: Opisthobranchiate (n.) One of the Opisthobranchiata.

Opisthobranchiate :: Opisthobranchiate (a.) Of or pertaining to the Opisthobranchiata.

Nudibranchiata :: Nudibranchiata (n. pl.) A division of opisthobranchiate mollusks, having no shell except while very young. The gills are naked and situated upon the back or sides. See Ceratobranchia..

Opisthobranchia :: Opisthobranchia (n. pl.) Alt. of Opisthobranchiat.

Pygobranchia :: Pygobranchia (n. pl.) A division of opisthobranchiate mollusks having the branchiae in a wreath or group around the anal opening, as in the genus Doris..

Rhinophore :: Rhinophore (n.) One of the two tentacle-like organs on the back of the head or neck of a nudibranch or tectibranch mollusk. They are usually retractile, and often transversely furrowed or plicate, and are regarded as olfactory organs. Called also dorsal tentacles. See Illust. under Pygobranchia, and Opisthobranchia..

Branchiogastropoda :: Branchiogastropoda (n. pl.) Those Gastropoda that breathe by branchiae, including the Prosobranchiata and Opisthobranchiata..

Euthyneura :: Euthyneura (n. pl.) A large division of gastropod molluske, including the Pulmonifera and Opisthobranchiata..

Opisthobranchiata :: Opisthobranchiata (n. pl.) A division of gastropod Mollusca, in which the breathing organs are usually situated behind the heart. It includes the tectibranchs and nudibranchs..

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