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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 theory of claspers comes to provide such an interpretation. A clasper, like a framed link, is an embedded topological object in a 3-manifold on which one can perform surgery. In fact, clasper calculus can be thought of as a variant of Kirby calculus on which only certain specific types of framed links are allowed.
In ray finned fish, they are called gonopodia or andropodia, and in cartilaginous fish, they are called claspers. Gonopodia are found on the males of some species in the Anablepidae and Poeciliidae families. They are anal fins that have been modified to function as movable intromittent organs and are used to impregnate females with milt during ...
In ray finned fish they are called gonopodiums or andropodiums, and in cartilaginous fish they are called claspers. Gonopodia are found on the males of some species in the Anablepidae and Poeciliidae families. They are anal fins that have been modified to function as movable intromittent organs and are used to impregnate females with milt ...
It has ten segments (S1-S10), terminating with appendages on S10. Males have both upper appendages and lower appendages (epiprocts in dragonflies and paraprocts in damselflies), which are used to hold females while mating; these are also termed claspers. Males also have secondary genitalia (including the anterior lamina, hamuli and posterior ...
The posterior part of a male shark's pelvic fins are modified into a pair of intromittent organs called claspers, analogous to a mammalian penis, of which one is used to deliver sperm into the female. [75] Mating has rarely been observed in sharks. [76] The smaller catsharks often mate with the male curling around the female.
Producing approximately 25-50% of a shark's power, the RM is what powers the continuous swimming of sharks. This muscle thrives in elevated temperatures and is seen as almost mammal-like. The optimal temperature range for function is 20 to 30 degrees Celsius, and the muscles are deemed ineffective if exposed to cooler temperatures.
Male insects possess an aedeagus, whose function is directly analogous to that of the vertebrate penis. Some insects also have claspers. Male moths have an additional organ called the juxta, which supports the aedeagus. These however are generalisations, and insect genitalia vary enormously in anatomy and in application.