wolffian reproductive organ intromittent organ http://purl.obolibrary.org/obo/UBERON_0008811 https://en.wikipedia.org/wiki/Intromittent_organ https://www.wikidata.org/wiki/Q11789797 An external organ of a male organism that is specialized to deliver sperm during copulation. Intromittent organs are found most often in terrestrial species, as most aquatic species fertilize their eggs externally, although there are exceptions. intromittent organs