Definition that contains sea slug
- subclass opisthobranchia gastropods having the gills when present posterior to the heart and having no operculum: includes sea slugs; sea butterflies; sea hares
- hermissenda genus of marine sea slugs
- hermissenda crassicornis a kind of sea slug
- opisthobranchia gastropods having the gills when present posterior to the heart and having no operculum: includes sea slugs; sea butterflies; sea hares
- genus hermissenda genus of marine sea slugs