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Pelvic spurs (also known as vestigial legs) are external protrusions found around the cloaca in certain superfamilies of snakes belonging to the greater infraorder Alethinophidia. [1] These spurs are made up of the remnants of the femur bone, which is then covered by a corneal spur, or claw-like structure. [ 1 ]
The pelvic spurs are usually held in the "erect" position and used by the male (at least) to stimulate the female. During mating, the male has a tendency to dig his pelvic spurs into the female's body. Whilst crawling over the female the male's spurs will scratch the surface of the female snake often making a distinct scratching sound.
Other examples of sexual dimorphism in the species include males generally having longer tails to contain the hemipenes and also longer pelvic spurs, which are used to grip and stimulate the female during copulation. [23] Pelvic spurs are the only external sign of the rudimentary hind legs and pelvis and are seen in all boas and pythons.
Boas and pythons have vestigial pelvis remnants, which are externally visible as two small pelvic spurs on each side of the cloaca. These spurs are sometimes used in copulation, but are not essential, as no colubrid snake (the vast majority of species) possesses these remnants. Furthermore, in most snakes, the left lung is greatly reduced or ...
[21] [22] [23] Pythons also possess two functioning lungs, unlike more advanced snakes, which have only one, and also have small, visible pelvic spurs, believed to be the vestiges of hind limbs. [22] [23]
Pelvic spurs, modified spine-like scales, are found in addition to the hind-limb ‘flaps’ on males, are thought to assist the male in gripping the female. [4]
Essentially, kegel exercises are a way of contracting the muscles of the pelvic floor, which give you greater control and intensity during sex. Try lifting your penis up and down with your muscles ...
All members of the genus Cylindrophis share the following five characteristics: 1) a relatively blunt head, not distinct from the neck, with minute eyes and a mental groove; 2) the absence of well-developed ventral scales, with ventral scales only slightly larger than or equal in size to the dorsal scales; (3) the presence of a pair of pelvic ...