†family Megalonychidae Gervais 1855 (ground sloth)
Synonyms: Bradypidae Gray 1825, Bradypodidae Gray 1825, Choloepidae Gray 1871, Choloepina Gray 1871
Parent taxon: Eutardigrada according to T. J. Gaudin 1995
Sister taxa: Megatheriidae, Mylodontidae
Subtaxa: Acratocnus, Ahytherium, Amphihapalops, Amphiocnus, Australonyx, Bradypodina, Choloepus, Diabolotherium, Diheterocnus, Eugeronops, Hyperleptus, Mecorhinus, Megalocninae, Megalocnus, Megalonychinae, Megalonychops, Megalonychotherium, Megalonyx, Meizonyx, Mesocnus, Metopotherini, Microcnus, Miocnus, Nothropus, Ocnopodinae, Ortotheriinae, Ortotherium, Paranabradys, Pliometanastes, Pliomorphus, Proplatyarthrus, Protomegalonyx, Torcellia
Ecology: ground dwelling herbivore