†family Polymastodontidae Cope 1884 (multituberculate)
Parent taxon: Multituberculata according to R. Lydekker 1894
Sister taxa: Ameribaatar, Arginbaataridae, Chirogidae, Hahnotheriidae, Haramyidae, Kermackodontidae, Plagiaulacida
Subtaxa: none
Ecology: arboreal herbivore