External organ of a male organism that is specialized to deliver sperm during copulation
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An intromittent organ is any external organ of a male organism that is specialized to deliver sperm during copulation.[1][2] Intromittent organs are found most often in terrestrial species, as most non-mammalian aquatic species fertilize their eggs externally, although there are exceptions. For many species in the animal kingdom, the male intromittent organ is a hallmark characteristic of internal fertilization.[3]
^Brennan, Patricia L. R. (October 2016). "Studying Genital Coevolution to Understand Intromittent Organ Morphology". Integrative and Comparative Biology. 56 (4): 669–681. doi:10.1093/icb/icw018. PMID 27252198.
^Kelly, Diane A.; Moore, Brandon C. (October 2016). "The Morphological Diversity of Intromittent Organs". Integrative and Comparative Biology. 56 (4): 630–634. doi:10.1093/icb/icw103. PMID 27471228.
^Eberhard, W. G. (1985). Sexual selection and animal genitalia. Cambridge, MA: Harvard University Press.
and 28 Related for: Intromittent organ information
An intromittentorgan is any external organ of a male organism that is specialized to deliver sperm during copulation. Intromittentorgans are found most...
animals. The term penis applies to many intromittentorgans, but not to all. As an example, the intromittentorgan of most Cephalopoda is the hectocotylus...
finned fishes, have fins that have been modified to function as intromittentorgans, reproductive appendages which allow internal fertilization. In ray...
the lips of the cloacae together, which is sometimes known as an intromittentorgan which is known as a phallus that is analogous to the mammals' penis...
from the Latin pēnis, initially "tail") is an external male sex organ (intromittentorgan) that additionally serves as the urinary duct. The main parts...
A hemipenis (pl.: hemipenes) is one of a pair of intromittentorgans of male squamates (snakes and lizards). Hemipenes are usually held inverted within...
The penis of the Opiliones (harvestmen) is an intromittentorgan that is not present in other arachnids. It consists of a long shaft (the truncus) and...
system in females is the female reproductive system. The penis is an intromittentorgan with a long shaft, an enlarged bulbous-shaped tip called the glans...
chinensis have large genital sclerites located at the end of their intromittentorgan. This is used to transfer sperm more effectively as they act as anchors...
terminal portion of the ejaculatory duct may be sclerotized to form the intromittentorgan, the aedeagus. The remainder of the male reproductive system is derived...
with smaller fins; the anal fin of the male may be modified into an intromittentorgan by means of which internal fertilization takes place. Most pupfishes'...
and certain other groups of animals, this is done by copulation, an intromittentorgan being introduced into the vagina or cloaca. In most birds, the cloacal...
population of this species in the United Kingdom. In another example, the intromittentorgan of male thistle tortoise beetles is a long, tube-like structure called...
finned fishes, have fins that have been modified to function as intromittentorgans, reproductive appendages which allow internal fertilization. In ray...
reach 30 cm (12 in). Male fish have the anal fin modified into an intromittentorgan with the tip angled to one side. Female fish have a flap of skin covering...
of sperm from male to female during mating, and thus are a type of intromittentorgan. In crustaceans and millipedes, gonopods are modified walking or swimming...
fertilises the eggs by piercing the female's abdominal wall with his intromittentorgan. They also have distinctive paired structures called mycetomes inside...
penises. Meanwhile, critics have argued that it does not fit the intromittentorgan definition of "a structure that enters the female genital tract and...
(Miridae) also practice traumatic insemination. In these bugs, the male intromittentorgan is formed by the coupling of the aedeagus with the left paramere,...
they are being laid, however males of the genus Ascaphus possess an intromittentorgan, unique among anurans, for internal fertilization. Internal fertilization...
how internal fertilization occurs, as the male frog has no obvious intromittentorgan. Iskandar, D. T.; Evans, B. J.; McGuire, J. A. (2014). "A novel reproductive...
Briskie, J. V.; R. Montgomerie (1997). "Sexual Selection and the IntromittentOrgan of Birds". Journal of Avian Biology. 28 (1): 73–86. doi:10.2307/3677097...
ISSN 1469-7998. Reese, A. M. (1924). "The structure and development of the intromittentorgan of the Crocodilia". Journal of Morphology. 38 (3): 301–313. doi:10...
female's reproductive tract, then places his own sperm there. The intromittentorgan of the male has spines that physically remove rival sperm and also...
Briskie, James; Montgomerie, Robert (1997). "Sexual selection and the intromittentorgan of birds". Journal of Avian Biology. 28 (1): 73–86. doi:10.2307/3677097...
The terminal portion of the duct may be sclerotized to form the intromittentorgan, the aedeagus. Insect respiration is accomplished without lungs. Instead...
elongated. The reproductive organs are similar to those in cockroaches but are more simplified. For example, the intromittentorgan is not present in male...
all families of catfish. The modification of the anal fin into an intromittentorgan (in internal fertilizers) as well as accessory structures of the reproductive...
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