Osteocephalus yasuni Ron and Pramuk, 1999, Herpetologica, 55: 435. Holotype: QCAZ 11336, by original designation. Type locality: "at the Yasuní Scientific Research Station (76° 24′ 19″ W, 00° 04′ 32″ S; altitude 230 m), Provincia del Napo, Ecuador".
None noted.
Upper Amazon Basin in Ecuador within a latitudinal range ecompassed by the Rio Napo to the north and the Rio Yasuni to the south; also known from two localities near Iquitos, Departamento Loreto, in northeastern Peru, as well as in adjacent Amazonas, Colombia, all localities 180-250 m elevation.
Colombia record provided by Lynch, 2002, Rev. Acad. Colomb. Cienc. Exact. Fis. Nat., 26: 289-292. Cisneros-Heredia, 2007, Herpetozoa, 19: 183, provided a record from Tiputini Biodiversity Station, 31 km east of the type locality and discussed aspects of the diagnosis. Cisneros-Heredia, 2007, Herpetozoa, 19: 183, provided a new record and documented ontogenetic changes in coloration.
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