only in taxon only_in_taxon capable of part of capable of part of copulation Eumetazoa male reproductive organ intromittent organ HAO:0000091 copulatory organ 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[WP]. uberon Wikipedia:Intromittent_organ Surface structure that is an external structure of a male organism through which sperm is transferred to a female organism during mating.[TAO] this is a broad grouping class connecting a number of different analagous organs by their function. We place the insect aedeagus here rather than penis, although this is somewhat arbitrary given the broadness of the current definition FBbt:00004850 AAO:0010255 TAO:0002036 aedeagus penis TGMA:0000585 UBERON:0008811