Assertion: crown | /r/HasProperty | coined by r. p. s. jefferies
Facets:
value: in 1979
type: TEMPORAL
Source sentences:
text: The concept was developed by Willi Hennig, the formulator of phylogenetic systematics, as a way of classifying living organisms relative to their extinct relatives in his "Die Stammesgeschichte der Insekten", and the "crown" and "stem" group terminology was coined by R. P. S. Jefferies in 1979.