Amphignathodon guentheri Boulenger, 1882, Cat. Batr. Sal. Coll. Brit. Mus., Ed. 2: 450. Holotype: BMNH 1946.9.7.28 according to Condit, 1964, J. Ohio Herpetol. Soc., 4: 86, animal figured on pl. 30 of the original publication. Type locality: "Intac", Imbabura Province, Ecuador.
Gastrotheca guentheri — Duellman, Maxson, and Jesiolowski, 1988, Copeia, 1988: 531.
Gunther's Marsupial Frog (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 53).
Pacific slopes of Andes in Ecuador (Pichincha and Cotopaxi provinces) and southern Colombia (Antioquia to Nariņo departments), 1200-2010 m elevation.
In the Gastrotheca ovifera group of Duellman, Maxson, and Jesiolowski, 1988, Copeia, 1988: 527-543. See photograph, map, description of geographic range and habitat, and conservation status in Stuart, Hoffmann, Chanson, Cox, Berridge, Ramani, and Young, 2008, Threatened Amph. World: 396. Wiens, 2011, Evolution, 65: 1283-1296, rediscovered the well-known fact ( Boulenger, 1882, Cat. Batr. Sal. Coll. Brit. Mus., Ed. 2: 450) that Gastrotheca guentheri has teeth in its lower jaw, the only frog known to do so.
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