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.
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- ectothermic
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animals which must use heat acquired from the environment and behavioral adaptations to regulate body temperature
- bilateral symmetry
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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.