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opisthobranchia 软体动物类 软体动物类 Opisthobranchia n 1: gastropods having the gills when present posterior to the heart and having no operculum: includes sea slugs; sea butterflies; sea hares [synonym: {Opisthobranchia}, {subclass Opisthobranchia}] Opisthobranchia \O*pis`tho*bran"chi*a\, Opisthobranchiata
\O*pis`tho*bran`chi*a"ta\, n. pl. [NL., from Gr. 'o`pisqen behind ? gills.] (Zool.) A division of gastropod Mollusca, in which the breathing organs are usually situated behind the heart. It includes the tectibranchs and nudibranchs. [1913 Webster]
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