Pygobranchia

Pygobranchia: Pygobranchia Py`go*bran"chi*a, n. pl. [NL., fr. Gr. pugh` the rump + ? a gill.] (Zo["o]l.) A division of opisthobranchiate mollusks having the branchi[ae] in a wreath or group around the anal opening, as in the genus Doris. [1913 Webster]

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dorsal tentacles — Rhinophore Rhi no*phore, n. [Rhino + Gr. fe rein to bear.] (Zo[ o]l.) 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… … The Collaborative International Dictionary of English
Rhinophore — Rhi no*phore, n. [Rhino + Gr. fe rein to bear.] (Zo[ o]l.) 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… … The Collaborative International Dictionary of English

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