Eleutherodactylus acerus Lynch and Duellman, 1980, Misc. Publ. Mus. Nat. Hist. Univ. Kansas, 69: 12. Holotype: KU 165471, by original designation. Type locality: "11 km ESE Papallacta, Provincia Napo, Ecuador, 2660 m."
Eleutherodactylus (Eleutherodactylus) acerus — Lynch, 1996, in Powell and Henderson (eds.), Contr. W. Indian Herpetol.: 154. Lynch and Duellman, 1997, Univ. Kansas Mus. Nat. Hist. Spec. Publ., 23: 219.
Pristimantis acerus — Heinicke, Duellman, and Hedges, 2007, Proc. Natl. Acad. Sci. USA, Suppl. Inform., 104: Table 2.
Pristimantis (Pristimantis) acerus — Hedges, Duellman, and Heinicke, 2008, Zootaxa, 1737: 128.
Papallacta Robber Frog (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 72).
Known only from the type locality and vicinity between Papallacta and Cuyujúa (Napo Province, Ecuador) in upper montane cloud forest, 2660-2750 m.
In the Eleutherodactylus (Eleutherodactylus) martinicensis series, Eleutherodactylus unistrigatus group of Lynch and Duellman, 1997, Univ. Kansas Mus. Nat. Hist. Spec. Publ., 23: 219. 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 acerus) in Stuart, Hoffmann, Chanson, Cox, Berridge, Ramani, and Young, 2008, Threatened Amph. World: 314.
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