Dorsolateral and ventral views of adult specimens of the four most similar species to Osteocephalus vasquezi sp. nov. A, B. Male of O. festae CORBIDI 758; C, D. Female of O. festae CORBIDI 761; E, F. Male of O. mimeticus CORBIDI 9972 from Mishquillaquillo, San Martin; G, H. Female of O. mimeticus CORBIDI 9970; I, J. Male of O. verruciger CORBIDI 9477; K, L. Female of O. verruciger CORBIDI 9525 from Cordillera de Kampankis, Loreto. Photographs A–H by P.J. Venegas and I–L by A. Catenazzi.

 
 
  Part of: Venegas PJ, García-Ayachi LA, Toral E, Malqui J, Ron SR (2023) A new species of spiny-backed tree frog, genus Osteocephalus (Anura, Hylidae), from the Yanachaga Chemillén National Park in central Peru. Evolutionary Systematics 7(2): 237-251. https://doi.org/10.3897/evolsyst.7.102360