The Earliest-Known Stem  Mammals

DESCRIBER    Crompton & Jankins, 1968
TIME    Jurassic Early
(\"Liassic\" )
CLASS    Mammalia
SUBCLASS    Incertae Sedis
ORDER    Morganucodonta (Kermack, et al., 1973)
FAMILY    Megazostrodontidae (Gow, 1986)
FOSSILSITE    Red Beds, Stormberg Group, Lesotho; Upper Eliot Formation, Orange Free State, South Africa
INFO
Typespecies by monotype. Megazostrodon is characterized by an extremely well-developed labial cingulum with more robust cusps than Morganucodontidae