1) Family aplysiidae 2) Family tethyidae 3) Mollusk family 4) Sea hares 5) Tethyidae 1) Tethyidae 
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...
[n] - sea hares
family Aplysiidae noun sea hares