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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. [1] [2] In the mating of banana slugs, the penis is inserted into the body of the partner.
In the case where one penis is chewed off, this is usually done by the other slug. A replacement penis does not grow back. Apophallation is most widely found in Ariolimax species, [1] which have internal sperm exchange. In these slugs, apophallation is only an occasional occurrence which follows a period of struggle and pulling by the owner.
Banana slugs are hermaphroditic, meaning they are both male and female at the same time. [3] During reproduction, Ariolimax buttoni engages in apophallation - the behavior in which a slug chews off its mating partner's penis. [5] Their mating season is very long, lasting from February to early September. In addition, the copulation itself is long.
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Post mating, banana slugs will some times gnaw off their partners penis as an act of sperm competition called apophallation. [32] This is costly as they must heal, and spend more energy courting conspecifics that can act as male and female.
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Entwined everted penises of a pair of mating hermaphrodite slugs in the species Limax maximus.. The reproductive system of gastropods (slugs and snails) varies greatly from one group to another within this very large and diverse taxonomic class of animals.