Pseudohyla nigrogrisea Andersson, 1945, Ark. Zool., 37A(2): 87. Syntypes: NHRM 1905 (6 specimens), according to J.D. Lynch in Frost, 1985, Amph. Species World: 306. Type locality: "Baņos, [Provincia Tungurahua,] Eastern Ecuador".
Eleutherodactylus nigrogriseus — Lynch, 1969, Bull. S. California Acad. Sci., 68: 219-224.
Eleutherodactylus (Eleutherodactylus) nigrogriseus — Lynch and Duellman, 1997, Univ. Kansas Mus. Nat. Hist. Spec. Publ., 23: 229.
Pristimantis nigrogriseus — Heinicke, Duellman, and Hedges, 2007, Proc. Natl. Acad. Sci. USA, Suppl. Inform., 104: Table 2.
Pristimantis (Pristimantis) nigrogriseus — Hedges, Duellman, and Heinicke, 2008, Zootaxa, 1737: 128.
Charcoal Robber Frog (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 77).
Cloud forests along the eastern face of the Andes in Ecuador, 1150-2600 m elevation.
Discussed by Lynch, 1969, Bull. S. California Acad. Sci., 68: 219-224, who removed it from the synonymy of Eleutherodactylus palmeri, where it had been placed by Cochran and Goin, 1970, Bull. U.S. Natl. Mus., 288: 398. See also brief account by Lynch and Duellman, 1980, Misc. Publ. Mus. Nat. Hist. Univ. Kansas, 69: 43-44. In the Eleutherodactylus (Eleutherodactylus) martinicensis series, Eleutherodactylus unistrigatus group according to Lynch and Duellman, 1997, Univ. Kansas Mus. Nat. Hist. Spec. Publ., 23: 229. 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 nigrogriseus) in Stuart, Hoffmann, Chanson, Cox, Berridge, Ramani, and Young, 2008, Threatened Amph. World: 360.
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