These unusual snails are pelagic, shell-less carnivores, equipped with swimming parapoda, strong jaws and grasping tentacles, often with suckers resembling those of cephalopods.
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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.