Aplysia extraordinaria

Aplysia extraordinaria, common name the "extraordinary sea hare", is a very large species of sea slug, more specifically a sea hare, a marine opisthobranch gastropod mollusk in the family Aplysiidae, the sea hares. Its distribution includes the coast off of eastern Australia, northern New Zealand, and possibly a wider range.

It is most likely the same species as Aplysia gigantea which is found off of the western coast of Australia, but this has yet to be confirmed.