Opisthobranchia
Of class and Gastropoda. May also be referred to as subclass Opisthobranchia.
Gastropods having the gills when present posterior to the heart and having no operculum: includes sea slugs; sea butterflies; sea hares.
This concept's ID is @1~9936
Contains
- Nudibranchia
Comprising numerous marine gastropod mollusks lacking a shell in the adult state and...