Systematics of spiny-backed treefrogs (Hylidae: Osteocephalus): an Amazonian puzzle - Jungfer, Karl-Heinz; Faivovich, Julián; Padial, José M; Castroviejo-Fisher, Santiago; Lyra, Mariana M; Berneck, Bianca V. M; Iglesias, Patricia P; Kok, Philippe J. R; MacCulloch, Ross D; Rodrigues, Miguel Trefaut; Verdade, Vanessa K; Gastello, Claudia P. Torres; et al. (Zoologica Scripta, 2013)