†Pachybiotherium Ameghino 1902 (marsupial)
Mammalia - Microbiotheria - Microbiotheriidae
Parent taxon: Microbiotheriidae according to F. J. Goin 1997
Sister taxa: Dromiciops, Eodidelphys, Hadrorhynchus, Khasia, Microbiotheriinae, Microbiotherium, Mirandatherium, Prodidelphys, Stylognathus
Subtaxa: Pachybiotherium minor
Ecology: scansorial insectivore