Apophallation is the biting off of the penis, known to occur in terrestrial slugs and, reportedly, in some species of banana slugs, which results in the apophallated slug being able to mate as a female.
Apophallation is the biting off of the penis, known to occur in terrestrial slugs, which are hermaphroditic gastropod mollusks. It has been reported in some species of banana slugs, Ariolimax, and in the distantly related Deroceras laeve. No replacement penis grows, but the apophallated slug can mate as a female. 
