The Aplysidae have tentacles (rhinophores) shaped like the ears of rabbits, from which they get their common name, "sea hares." Commonly behind the head is a neck-like region that merges into a plump trunk. The entire body is often covered with warts or other projections.
- bilateral symmetry
having body symmetry such that the animal can be divided in one plane into two mirror-image halves. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends. Synapomorphy of the Bilateria.
animals which must use heat acquired from the environment and behavioral adaptations to regulate body temperature