Chiasmocleis bassleri Dunn, 1949, Am. Mus. Novit., 1419: 9. Holotype: AMNH 42699, by original designation. Type locality: "Rio Utoquinia to Rio Tapiche, Peru (near the Brazilian border)".
Bassler's Humming Frog (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 88).
Amazonian Colombia, Ecuador, Peru, and Acre, Rondonia, and northwestern Mato Grosso, Brazil.
Possible occurrence in Bolivia mentioned by De la Riva, Köhler, Lötters, and Reichle, 2000, Rev. Esp. Herpetol., 14: 51. Peloso and Sturaro, 2008, Zootaxa, 1947: 40, suggested that because the holotype is in poor condition and the type locality vague that application of this name to a particular living populations may be problematic. Morales and McDiarmid, 2009, Biotempo, Lima, 9: 74, suggested that the specimens reported from Santa Cecilia, Ecuador, and Iquitos, Peru, show distinctive characteristics that may suggest that these populations are not referrable to Chiasmocleis bassleri. Rodrigues, Noronha, Lima, and Rosa, 2011, Check List, 7: 846-848, provided a range extension and a spot map.
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