Clasper
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In biology, a clasper is a male anatomical structure found in some groups of animals, used in mating.
Male cartilaginous fish have claspers formed from the posterior portion of their pelvic fin which serve 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] The claspers of many shark species have spines or hooks,[3] which may hold them in place during copulation.[4] Many male holocephalans, including living chimaeras, have cephalic claspers (tenacula) on their heads, which are thought to aid in holding the female during mating.[5]
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
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- ^ Page Module:Citation/CS1/styles.css has no content."System glossary". FishBase. Retrieved 2013-02-15.
- ^ Page Module:Citation/CS1/styles.css has no content.Heinicke, Matthew P.; Naylor, Gavin J. P.; Hedges, S. Blair (2009). The Timetree of Life: Cartilaginous Fishes (Chondrichthyes). Oxford University Press. p. 320. ISBN 978-0191560156.
- ^ Page Module:Citation/CS1/styles.css has no content.Compagno, Leonard J. V.; Nations, Food and Agriculture Organization of the United (2001). Sharks of the World: An Annotated and Illustrated Catalogue of Shark Species Known to Date. Food & Agriculture Org. ISBN 978-92-5-104543-5.
- ^ Page Module:Citation/CS1/styles.css has no content.Klimley, A. Peter; Ainley, David G. (1998-04-03). Great White Sharks: The Biology of Carcharodon carcharias. Academic Press. ISBN 978-0-08-053260-8.
- ^ Page Module:Citation/CS1/styles.css has no content.Stahl, Barbara (1999). Handbook of Paleoichthyology Volume 4 • Chondrichthyes III • Holocephali. pp. 29–30.
