Mammalia - Megatherioidea - Megalonychidae
Parent taxon: Megalonychidae according to L. Varela et al. 2019
See also Hay 1930 and Hirschfeld 1985
Sister taxa: Amphihapalops, Amphiocnus, Analcimorphus, Choloepodinae, Deseadognathus, Diheterocnus, Eleutherodon, Eucholoeops, Eugeronops, Geronops, Hapalops, Holomegalonyx, Hyperleptus, Mecorhinus, Megalocninae, Megalonychops, Megalonychotherium, Meizonyx, Mesocnus, Mesopotamocnus, Metopotherinae, Metopotherini, Microcnus, Miocnus, Nohochichak, Nothropus, Ocnopodinae, Ortotheriinae, Ortotherium, Paranabradys, Paraplanops, Pattersonocnus, Pliomorphus, Protomegalonyx, Pseudhapalops, Pseudortotherium, Torcellia, Trematherium, Urumacocnus, Xibalbaonyx, Zacatzontli
Subtaxa: Ahytherium Australonyx Ereptodon Megalonyx Megistonyx Pliometanastes Sinclairia
Type: Megalonyx
Ecology: ground dwelling herbivore
Distribution:
• Quaternary of Brazil (2 collections), Canada (4: Alberta, Northwest Territories, Saskatchewan, Yukon), El Salvador (1), Guatemala (2), Honduras (1), United States (89: Alabama, Arizona, Arkansas, California, Florida, Georgia, Idaho, Illinois, Iowa, Kansas, Maryland, Mississippi, Missouri, Montana, Nebraska, New Jersey, North Dakota, Ohio, Oklahoma, Pennsylvania, South Carolina, South Dakota, Tennessee, Texas, Utah, Virginia, West Virginia), Venezuela (1)
• Blancan of El Salvador (1), Mexico (3), United States (36: Arizona, California, Florida, Idaho, Kansas, Nebraska, Nevada, New Mexico, South Dakota, Texas, Washington)
• Pliocene of Brazil (1), United States (2: California, Texas)
• Hemphillian of Costa Rica (1), Mexico (7), United States (27: California, Florida, Nebraska, New Mexico, Oklahoma, Oregon, Texas)
• Miocene of Colombia (4)
Total: 182 collections including 188 occurrences