Clasper

In biology, a clasper is a male anatomical structure found in some groups of animals, used in mating.

A close up view of a chimaera clasper (Hydrolagus collie). Note the many small tooth-like projections covering the exterior surface.
"Valva" redirects here. For other uses, see Valva (disambiguation).
For the mathematics topic, see Clasper (mathematics).
The claspers of a spotted wobbegong shark (Orectolobus maculatus)
The claspers of a young spinner shark (Carcharhinus brevipinna)

Male cartilaginous fish have claspers formed from the posterior portion of their pelvic fin which serve as is used to channel semen into the female's cloaca during mating. The act of mating in some fish including sharks usually includes one of the claspers raised to allow water into the siphon through a specific orifice. The clasper is then inserted into the cloaca, where it opens like an umbrella to anchor its position. The siphon then begins to contract, expelling water and sperm.[1][2] Male chimaeras have cephalic claspers (tenacula) on their heads, which are thought to aid in holding the female during mating.

In entomology, it is a structure in male insects that is used to hold the female during copulation (see Lepidoptera genitalia for more).

See also

References
  1. "System glossary". FishBase. Retrieved 2013-02-15.
  2. Heinicke, Matthew P.; Naylor, Gavin J. P.; Hedges, S. Blair (2009). The Timetree of Life: Cartilaginous Fishes (Chondrichthyes). Oxford University Press. p. 320. ISBN 0191560154.
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