An everted hemipenis of a North American rattlesnake (Crotalus adamanteus).Common house geckos, mating, ventral view with hemipenis inserted in the cloaca
A hemipenis (pl.: hemipenes) is one of a pair of intromittent organs of male squamates (snakes and lizards).[1][2][3] Hemipenes are usually held inverted within the body, and are everted for reproduction via erectile tissue, much like that in the human penis. They come in a variety of shapes, depending on species, with ornamentation such as spikes.
^"Hemipenes".
^"Male reproductive behaviour of Naja oxiana (Eichwald, 1831) in captivity, with a case of unilateral hemipenile prolapse". Herpetology Notes. 2018. (Full text via https://www.biotaxa.org/hn/article/view/34541/37750.)
^Holmes MM, Putz O, Crews D, Wade J (April 2005). "Normally occurring intersexuality and testosterone induced plasticity in the copulatory system of adult leopard geckos". Horm Behav. 47 (4): 439–45. doi:10.1016/j.yhbeh.2004.11.020. PMID 15777809. S2CID 18482667.
A hemipenis (pl.: hemipenes) is one of a pair of intromittent organs of male squamates (snakes and lizards). Hemipenes are usually held inverted within...
located in the base of the tail. The hemipenis is retracted inside of the body when mating is not occurring. The hemipenis is similar to the human penis. Females...
possessing larger preanal pores than the females as well as a distinct hemipenis pocket. Males tend to be stockier than females with the exception of R...
birds, mammals, and turtles. The hemipenis can be found in the base of the tail. The tuatara does not have a hemipenis, but instead has shallow paired...
reproduce with internal fertilization through cloacal copulation (see also hemipenis),[citation needed] while placental mammals copulate by inserting the male's...
evidence indicates that males alternate use between copulations. The hemipenis has a variety of shapes, depending on the species. Often it bears spines...
inserting a probe into the cloaca to check the presence of an inverted hemipenis. The ball python is native to west Sub Saharan Africa from Senegal through...
bilobed hemipenis in males. It is most closely related to the genera Myrrophis and Gyiophis, from which it can be distinguished by its bilobed hemipenis as...
spineless hemipenis without papillae; the hemipenis has a long calyculate region beginning at some distance from the fork of the hemipenis and continuing...
vents nearly touching. The male then everts one of its sex organs, a hemipenis, into the female sex organ, the cloaca. The mating lasts a few minutes...
species. Delma butleri has also been misidentified as Delma inornata. The hemipenis is a consistent differentiating morphology between species of Delma. The...
male examples of Squamata, have two hemipenes. During copulation, one hemipenis is inserted into the female's cloacal vent. A female can store sperm from...
Michael; Walley, Harlan D. (25 August 2009). "Behavioural correlates with hemipenis morphology in New World natricine snakes". Biological Journal of the Linnean...
group differing from Lacerta by the construction of the skull and the hemipenis, and by the processes of the caudal vertebrae. They are commonly known...
at the tip to allow firm attachment to the female. To become erect, a hemipenis is evaginated (turned inside out) through muscle action and engorgement...
classification of the Chamaeleonidae (Sauria) with special reference to hemipenis morphology". Bonner Zoologische Monographien. 22: 1–64. Tilbury, Colin...
posterior chin shields. Each maxilla has 9–12 small teeth. The single hemipenis has a forked sulcus spermaticus and three large basal spines. Juveniles...
insularis is the occurrence of "intersexes", individuals born with both a hemipenis and female reproductive parts. Duarte et al. attribute these intersexes...
undivided subcaudals for the full length of the tail, as well as a simple hemipenis completely covered in calyces with a largely non-bifurcated sulcus spermaticus...
Classification of the Chamaeleonodae (Sauria), with special reference to hemipenis morphology". Bonn. zool. Monogr. 22: 1-64. (Calumma boettgeri, new combination)...
his vent for mating. Males seem to alternate between the left and right hemipenis on successive matings. The female matures one ovarian follicle at a time...
corkscrew shaped penis, similar to those of the other ratites and to the hemipenis of some reptiles. The female has a small phallic organ in the cloaca which...
to 30 days to hatch. The male vasas' cloaca is able to invert into a hemipenis, which becomes erect during mating – a feature unique to the genus. This...
meaning "lord of animals". It is also a phallic symbol. The lizard's hemipenis is visible at times, an organ that has been described as "aberrant" in...
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