P. pattersoni Slaughter, 1965 Slaughteria Butler, 1978 Pappotherium is an extinct genus of mammals from the Albian (early Cretaceous) of Texas, US, known from a fossilized maxilla fragment bearing two tribosphenic molars, discovered within the Glen Rose Formation near Decatur, Wise County, Texas.

[1] On the basis of the morphology of the molars' cusps, in 1965 Slaughter established the new genus Pappotherium and the new species P. pattersoni; he also created an apposite family, Pappotheriidae.

Slaughter argued that Pappotherium should have been a basal form close to the metatherian-eutherian divergence point; this mammal likely was an arboreal insectivore.

[1] Etymologically speaking, the name Pappotherium is a compound of the Latin words pappus (from ancient Greek πάππος, páppos, “grandfather”) and therium (from ancient Greek θηρίον, thēríon, “beast”, a common suffix among extinct mammals), with the full meaning of “mammal-grandfather”.

[4] Holoclemensia Pappotherium Sulestes Oklatheridium Tsagandelta Lotheridium Deltatheroides Deltatheridium Nanocuris Atokatheridium Marsupialiformes