Editing Clade (section)

==Naming and etymology==
The term "clade" was coined in 1957 by the biologist [[Julian Huxley]] to refer to the result of [[cladogenesis]], the evolutionary splitting of a parent species into two distinct species, a concept Huxley borrowed from [[Bernhard Rensch]].<ref name="Dupuis-1984">{{cite journal | last=Dupuis | first=Claude | year=1984 | title=Willi Hennig's impact on taxonomic thought | journal=Annual Review of Ecology and Systematics | volume=15 | pages=1–24 | doi=10.1146/annurev.es.15.110184.000245| doi-access=free }}</ref><ref name="Huxley-1957">{{cite journal | last = Huxley | first = J. S. | year =1957 | title = The three types of evolutionary process | journal=Nature | volume=180 | issue = 4584 | pages=454–455 | doi=10.1038/180454a0| bibcode=1957Natur.180..454H | s2cid = 4174182 }}</ref>

Many commonly named groups – [[rodent]]s and [[insect]]s, for example – are clades because, in each case, the group consists of a common ancestor with all its descendant branches. Rodents, for example, are a branch of [[mammal]]s that split off after the end of the period when the clade [[Dinosaur]]ia stopped being the dominant terrestrial [[vertebrate]]s 66 million years ago. The original population and all its descendants are a clade. The rodent clade corresponds to the order Rodentia, and insects to the class Insecta. These clades include smaller clades, such as [[chipmunk]] or [[ant]], each of which consists of even smaller clades. The clade "rodent" is in turn included in the mammal, [[vertebrate]] and animal clades.