Eleutherodactylus quinquagesimus Lynch and Trueb, 1980, Copeia, 1980: 392. Holotype: KU 167859, by original designation. Type locality: "Quebrada Zapadores, 5 km ESE Chiriboga, 2010 m, Provincia Pichincha, Ecuador (latitude 00° 17′ S, longitude 78° 46′ W)".
Eleutherodactylus (Eleutherodactylus) quinquagesimus — Lynch, 1996, in Powell and Henderson (eds.), Contr. W. Indian Herpetol.: 154. Lynch and Duellman, 1997, Univ. Kansas Mus. Nat. Hist. Spec. Publ., 23: 231.
Pristimantis quinquagesimus — Heinicke, Duellman, and Hedges, 2007, Proc. Natl. Acad. Sci. USA, Suppl. Inform., 104: Table 2.
Pristimantis (Pristimantis) quinquagesimus — Hedges, Duellman, and Heinicke, 2008, Zootaxa, 1737: 121.
Zapadores Robber Frog (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 78).
Cloud forests (1410-2710 m elevation.) on the Pacific slopes of the western Andes in northwestern Ecuador and extreme southern Colombia.
In the Eleutherodactylus crucifer assembly of the Eleutherodactylus unistrigatus group and most closely allied with Eleutherodactylus calcaratus, Eleutherodactylus chloronotus, Eleutherodactylus crucifer, and Eleutherodactylus inusitatus, according to the original publication, and Eleutherodactylus tenebrionis, according to Lynch and Miyata, 1980, Breviora, 457: 8. See Lynch and Burrowes, 1990, Occas. Pap. Mus. Nat. Hist. Univ. Kansas, 136: 7. See account by Lynch and Duellman, 1997, Univ. Kansas Mus. Nat. Hist. Spec. Publ., 23: 127-129, who place it in the Eleutherodactylus (Eleutherodactylus) devillei group. In the Pristimantis (Pristimantis) devillei species group of Hedges, Duellman, and Heinicke, 2008, Zootaxa, 1737: 121. See photograph, map, description of geographic range and habitat, and conservation status (as Eleutherodactylus quinquagesimus) in Stuart, Hoffmann, Chanson, Cox, Berridge, Ramani, and Young, 2008, Threatened Amph. World: 372.
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