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

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

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

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..

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

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..

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

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..

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