Order Pilosa Author Wilson, Don E. Author Reeder, DeeAnn text 2005 The Johns Hopkins University Press Baltimore Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 1 100 103 book chapter 0-8018-8221-4 10.5281/zenodo.7316519 Bradypus tridactylus Linnaeus 1758 Bradypus tridactylus Linnaeus 1758 , Syst. Nat., 10th ed., Vol. 1: 34 . Type Locality: "Americæ meridionalis arboribus;" restricted to Surinam by Thomas (1911 a ) . Vernacular Names: Pale-throated Sloth . Synonyms: Bradypus ai (Lesson 1827) ; Bradypus blainvillii ( Gray 1850 ) ; Bradypus cuculliger Wagler 1831 ; Bradypus cummunis Lesson 1841 ; Bradypus dysonii ( Gray 1869 ) ; Bradypus flaccidus ( Gray 1850 ) ; Bradypus guianensis Blainville 1840 ; Bradypus gularis Rüppell 1842 ; Bradypus smithii ( Gray 1869 ) ; Bradypus flaccions Sanderson 1949 . Distribution: Guyana , Suriname , French Guiana, Venezuela south of the Orinoco, and N Brazil (south to the Amazonas /Solimões). Conservation: IUCN – Lower Risk (lc).