The superfamily Aplysioidea is a superfamily of mostly rather large sea slugs, marine gastropod mollusks in the clade Aplysiomorpha within the informal group Opisthobranchia. This superfamily contains only one family, the Aplysiidae; the sea hares. These animals are commonly called sea hares because, unlike most sea slugs, they are often quite lar... Found on http://en.wikipedia.org/wiki/Aplysiidae