aplysia(n = noun.animal) genus aplysia, genus tethus, tethys - type genus of the family Aplysiidae;
is a kind of mollusk genus
is a member of aplysiidae, family aplysiidae, family tethyidae, tethyidae

   A genus of marine mollusks of the order Tectibranchiata; the sea hare. Some of the species when disturbed throw out a deep purple liquor, which colors the water to some distance. See Illust. in Appendix. [1913 Webster]

aplysia punctata, genus aplysia