Bradypus Linnaeus, 1758 . Syst. Nat., 10th ed., 1:34.

TYPE SPECIES: Bradypus tridactylus Linnaeus, 1758, by subsequent designation (Miller and Rehn, 1901).

SYNONYMS: Acheus F. Cuvier, 1825; Arctopithecus Gray, 1850 (preoccupied); Eubradypus Lönnberg, 1942; Hemibradypus Anthony, 1906; Ignavus Blumenbach, 1779; Scaeopus Peters, 1865 .

COMMENTS: Avila-Pires (in Wetzel and Avila-Pires, 1980) considered Scaeopus a separate genus.