Phrynopus brunneus Lynch, 1975, Occas. Pap. Mus. Nat. Hist. Univ. Kansas, 35: 14. Holotype: USNM 192909, by original designation. Type locality: "10 km WNW El Carmelo (= Pun), Carchi Prov., Ecuador, 3150 m".
"Phrynopus" brunneus — Heinicke, Duellman, and Hedges, 2007, Proc. Natl. Acad. Sci. USA, 104: 10094. Heinicke, Duellman, and Hedges, 2007, Proc. Natl. Acad. Sci. USA, Suppl. Inform., 104: 4.
Isodactylus brunneus — Hedges, Duellman, and Heinicke, 2008, Zootaxa, 1737: 108.
Hypodactylus brunneus — Hedges, Duellman, and Heinicke, 2008, Zootaxa, 1795: 67-68.
Carchi Andes Frog (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 82).
Known from the type locality near el Carmelo (3150 m elevation), as well as about 30 km to the west at Chamizo, both localities in Carchi Province, Ecuador.
Cisneros-Heredia, 2004, Herpetozoa, 17: 194-195, provided the second locality for this species. Lehr, Fritzsch, and Müller, 2005, Zool. Scripta, 34: 593-603, suggested that Phrynopus brunneus is not nested among other Phrynopus, but imbedded in Eleutherodactylus, but hesitated to make the change pending additional resolution. Heinicke, Duellman, and Hedges, 2007, Proc. Natl. Acad. Sci. USA, 104: 10092-10097, removed this species from nominal Phrynopus but did not provide a new generic name; see comment under Hypodactylus.
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