We found 3 definitions of opisthobranchia from 3 different sources.
Noun |
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opisthobranchia - gastropods having the gills when present posterior to the heart and having no operculum: includes sea slugs; sea butterflies; sea hares | ||
subclass Opisthobranchia | ||
class elegance in dress or behavior; "she has a lot of class" | ||
class gasteropoda, class gastropoda, gasteropoda, gastropoda snails and slugs and their relatives |