Mammaliaformes Rowe 1988 [crown] Mammalia Linnaeus 1758 [Rowe 1988], nom. cl. inval. see Class Mammalia Linnaeus, 1758 Prototheria Gill 1872 [O'Leary, Allard, Novacek, Meng & Gatesy 2004] see Subclass Prototheria Gill, 1872 †Kollikodon ritchiei Flannery, Archer, Rich & Jones, 1995