Syncope antenori Walker, 1973, Occas. Pap. Mus. Nat. Hist. Univ. Kansas, 20: 3. Holotype: KU 124009, by original designation. Type locality: "Puerto Libre, Río Aguarico, 570 m, Provincia Napo, Ecuador".
Ecuador Silent Frog (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 93).
Napo and Pastaza, Ecuador; Amazonas (Loreto) and Madre de Dios (Manu), Peru.
Von May, Santa Cruz, and Jennings, 2007, Herpetol. Rev., 38: 476, provided a record from Madre de Dios, Peru.
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