The Earliest-Known Stem  Mammals

DESCRIBER    Hahn et al., 1991
TIME    Triassic Late
Rhaetian
CLASS    Mammalia
SUBCLASS    Incertae Sedis
ORDER    Morganucodonta (Kermack, et al., 1973)
FAMILY    Megazostrodontidae (Gow, 1986)
FOSSILSITE    Keuper Formation, Saint-Nicolas-de-Port, Lorraine, France
INFO

Brachyzostrodon coupatezi (Sigogneau-Russell, 1983 ) > Brachyzostrodon major (Hahn et al., 1991)  > Brachyzostrodon sp. (Hahn et al., 1991) > Brachyzostrodon sp. (Jenkins et al., 1994 )