SUBCLASS OPISTHOBRANCHIA

WordNet Dictionary

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

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	Synonyms:	Opisthobranchia

	See Also:	class, class Gasteropoda, class Gastropoda, Gasteropoda, Gastropoda, Nudibranchia, order Nudibranchia