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3 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 opisthobranchia
 軟體動物類

From: Webster's Revised Unabridged Dictionary (1913)

 O·pis·tho·bran·chi·a O·pis·tho·bran·chi·a·ta n. pl.  Zool. 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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From: WordNet (r) 2.0

 Opisthobranchia
      n : gastropods having the gills when present posterior to the
          heart and having no operculum: includes sea slugs; sea
          butterflies; sea hares [syn: subclass Opisthobranchia]