出典:Wiktionary
crown group (複数形 crown groups)
出典:Wikipedia
出典:『Wikipedia』 (2011/06/20 13:28 UTC 版)
A crown group is a group consisting of living representatives, their ancestors back to the most recent common ancestor of that group, and all of that ancestor's descendants. The name was given by Willi Hennig, the formulator of phylogenetic systematics, as a way of classifying living organisms relative to extinct ones. Though formulated in the 1970s, it was not commonly used until its reintroduction in the 2000s.