The Earliest-Known Stem  Mammals

DESCRIBER    Rigney, 1963
TIME    Jurassic Early
\"Liassic,\" ?Sinemurian
Class    Mammalia
SUBCLASS    Incertae Sedis
ORDER    Morganucodonta (Kermack, et al., 1973)
FAMILY    Morganucodontidae (Kühne, 1958)
FOSSILSITE    Lower Lufeng Formation, Yunnan, China
FALL UNDER    Morganucodon watsoni