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Sea slug is a common name used for several different groups of saltwater snails that either lack a shell or have only an internal shell. It is a paraphyletic name used for various lineages of marine gastropod molluscs that are either not conchiferous (shell-bearing) or appear not to be.
The phrase "sea slug" is often applied to nudibranchs (many members of which are colorful and are a noticeable part of the underwater fauna), sea hares, the sacoglossans, various families of bubble snails (Cephalaspidea), the sorbeoconch family Pterotracheoidea, the pulmonate (air-breathing) sea slug family Onchidiidae, and others.
- Fresh Science http://freshscience.org.au/2007/how-sea-slugs-fall-in-love
- Frontiers in Zoology http://www.frontiersinzoology.com/content/4/1/17
- Sea Slug Forum http://www.seaslugforum.net/