Sea Slugs are known to regenerate body parts that have been lost either through accident, attack or autotomy. If anyone has any recent references or observations they would be very welcome. Discussions and reports on regeneration are found in many parts of the Forum. A search of the Forum for regeneration should find most of them.
Rudman, W.B., 2001 (January 16) Regeneration. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/regener