group of marine invertebrates with varying levels of resemblance to terrestrial slugs From Wikipedia, the free encyclopedia
Sea slug is an informal name for a group of gastropods which look similar, but are not monophyletic. They are polyphyletic. Their similar shape and life styles is an example of convergent evolution. The group includes:
Sea slug | |
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Nembrotha kubaryana feeding on tunicates | |
Scientific classification | |
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(unranked): | clade Heterobranchia |
It would seem that their similar growth pattern, with the loss of torsion, bilateral symmetry, reduction of the Gastropod shell, and somewhat similar life styles, evolved a number of times in the Gastropods.
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