Another usage of autotomized penis

We described and compared the mating behavior morphology of reproductive system in chromodorid nudibranchs, then, examined how extensively unique usage penis (autotomy sperm removal) evolved among Chromodorids. In addition to Ardeadoris egretta, all five species Glossodoris autotomized their penises at last stage copulation. An interspecific difference was seen autotomy Noumea Goniobranchus. A spiral structure recognized vas deferens species. This is supposed be undifferentiated “next penises” stored deferens, which ensure successive copulation Though basic mechanism replenishment consistent, reason autotomize may not same. Goniobranchus reticulatus reported remove already partner’s storage organ(s) with backward-pointing spines on surface its penis. Contrary G. reticulatus, ten that present study did have thorny but smooth penises. When they penises, tip still remained vagina partners. suggests these nudibranchs function as a kind copulatory plugs.