Intromittent organ

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.

[1] 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.

[2] 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.

[3] Eberhard, W. G. (1985). Sexual selection and animal genitalia. Cambridge, MA: Harvard University Press.

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