Eleutherodactylus atratus Lynch, 1979, Misc. Publ. Mus. Nat. Hist. Univ. Kansas, 66: 5. Holotype: USNM 199675, by original designation. Type locality: "Suro Rancho, Provincia Morona-Santiago, Ecuador, 2683 m."
Eleutherodactylus (Eleutherodactylus) atratus — Lynch, 1996, in Powell and Henderson (eds.), Contr. W. Indian Herpetol.: 154. Lynch and Duellman, 1997, Univ. Kansas Mus. Nat. Hist. Spec. Publ., 23: 220.
Pristimantis atratus — Heinicke, Duellman, and Hedges, 2007, Proc. Natl. Acad. Sci. USA, Suppl. Inform., 104: Table 2.
Pristimantis (Pristimantis) atratus — Hedges, Duellman, and Heinicke, 2008, Zootaxa, 1737: 128.
Santiago Robber Frog (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 72).
2195-2850 m elevation on the Amazonian slopes of the eastern Andean Cordillera (Cordillera de Matanga to the Abra de Zamora) in southern Ecuador.
In the Eleutherodactylus (Eleutherodactylus) martinicensis series, Eleutherodactylus unistrigatus group according to Lynch and Duellman, 1997, Univ. Kansas Mus. Nat. Hist. Spec. Publ., 23: 220. In the Pristimantis (Pristimantis) unistrigatus species group of Hedges, Duellman, and Heinicke, 2008, Zootaxa, 1737: 128. See photograph, map, description of geographic range and habitat, and conservation status (as Eleutherodactylus atratus) in Stuart, Hoffmann, Chanson, Cox, Berridge, Ramani, and Young, 2008, Threatened Amph. World: 319.
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