Caecilia bassleri Dunn, 1942, Bull. Mus. Comp. Zool., 91: 518. Holotype: MCZ 19401, by original designation. Type locality: "Pastaza R. (Canelos to Marañón)", Ecuador.
Oscaecilia bassleri — Taylor, 1968, Caecilians of the World: 598.
Pastaza River Caecilian (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 24).
Lower Amazonian slopes and western Amazon Basin of Ecuador, and Peru, possibly into adjacent Colombia and Bolivia.
De la Riva, Köhler, Lötters, and Reichle, 2000, Rev. Esp. Herpetol., 14: 58, consider this species possibly to occur in Bolivia. Lynch, 2000 "1999", Rev. Acad. Colomb. Cienc. Exact. Fis. Nat., 23: 330, suggested that the species might be found in Colombia. Taylor and Peters, 1974, Univ. Kansas Sci. Bull., 50: 338, commented on the Ecuadorian specimens.
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