Order Xenarthra Author Alfred L. Gardner text 1993 Smithsonian Institution Press Washington and London Editor Don E. Wilson Editor DeeAnn M. Reeder Mammal Species of the World (2 nd Edition) 63 68 book chapter 193455 10.5281/zenodo.7353136 cc21ed7c-310d-4a28-b29f-cb3acaaa6947 1-56098-217-9 7353136 Choloepus Illiger, 1811 . Prodr. Syst. Mamm. Avium., p. 108 . TYPE SPECIES: Bradypus didactylus Linnaeus, 1758 , by subsequent designation ( Gray, 1827 ). SYNONYMS: Unaues Rafinesque, 1815 ; Unaus Gray, 1821 . COMMENTS: Reviewed by Wetzel (1985a) .