Osteocephalus is a genus of frogs, the slender-legged tree frogs, in the family Hylidae found in the Guianas, the Amazon Basin, Venezuela, Colombia, southeastern Brazil, and north-eastern Argentina. Males are warty, while females are smooth. Species There are currently 25 described species in Osteocephalus: O. alboguttatus O. buckleyi — Buckley's slender-legged tree frog O. cabrerai O. camufatus O. cannatellai O. carri O. castaneicola O. deridens O. duellmani O. festae O. fuscifacies O. helenae O. heyeri O. leoniae O. leprieurii — Cayenne slender-legged tree frog O. mimeticus O. mutabor O. oophagus O. planiceps O. sangay — Sangay casqued tree frog O. subtilis — Brazilian slender-legged tree frog O. taurinus — Manaus slender-legged tree frog O. verruciger — Ecuador slender-legged tree frog O. vilarsi O. yasuni References (1995a): Description of a central Amazonian and Guianan tree frog, genus Osteocephalus (Anura, Hylidae), with oophagous tadpoles. - Alytes, Paris 13(1), pp. [1-13] (2000): Two new species of hylid frogs, genus Osteocephalus, from Amazonian Ecuador. - Amphibia-Reptilia 21(3), pp. [327-340] (2002): A new species of Osteocephalus from Ecuador and a redescription of O. leprieurii (Duméril & Bibron, 1841) (Anura: Hylidae). - Amphibia-Reptilia 23(1), pp. [21-46] Jungfer, K.-H., J. Faivovich, J.M. Padial, S. Castroviejo-Fisher, M. Lyra, B. Von Muller Berneck, P. Iglesias, P.J.R. Kok, R.D. MacCulloch, M.T. Rodrigues, V.K. Verdade, C.P. Torres Gastello, J.C. Chaparro, P.H. Valdujo, S. Reichle, J. Moravec, V. Gvoždík, G. Gagliardi-Urrutia, R. Ernst, I. De la Riva, D.B. Means, A.P. Lima, J.C. Señaris, W.C. Wheeler and C.F.B. Haddad. (2013). Systematics of spiny-backed treefrogs (Hylidae: Osteocephalus) an Amazonian puzzle. Zoologica Scripta 42: 351–380. External links . 2007. Amphibian Species of the World: an Online Reference. Version 5.1 (10 October 2007). Osteocephalus. Electronic Database accessible at http://research.amnh.org/herpetology/amphibia/index.php. American Museum of Natural History, New York, USA. (Accessed: Apr 24, 2008). [web application]. 2008. Berkeley, California: Osteocephalus. AmphibiaWeb, available at http://amphibiaweb.org/. (Accessed: Apr 24, 2008). taxon Osteocephalus at http://www.eol.org. Taxon Osteocephalus at https://www.itis.gov/index.html. (Accessed: Apr 24, 2008). Taxon Osteocephalus at http://data.gbif.org/welcome.htm Hylidae