sister group; sister taxon
Technical term in phylogenetics for the closest relative(s) of a given taxon.
系統樹では、チンパンジーはヒトの姉妹群とされる。
In the phylogenetic tree, chimpanzees are considered the sister group of humans.
Compound of 姉妹 (shimai, 'sisters') and 群 (gun, 'group'), calque of English 'sister group'.