Smith & Noonan, 2001
This species was first described to science in 2001. The type specimen was collected in the Pacaraima Mountains in western Guyana. There it inhabited sclerophyll forest habitat and was observed to be active at night.
This is the smallest member of the genus Osteocephalus, measuring just over 3 centimeters in length. Its eyes are described as "large and bulgy" and "huge and protruding" and inspired the specific epithet exophthalmus. They are buff with a black cross shape across the iris; this eye coloration is a main feature that distinguishes the species from other frogs in the genus. Its body is brownish above and cream-colored below, and the back surface of the thighs are black. The vocal sac of the male is not well developed. The skin is mostly smooth with a few tubercles along the dorsal surface and a granular texture to the throat and belly.
- Barrio-Amorós, C. L. (2010). Amphibia, Hylidae, Osteocephalus exophthalmus Smith and Noonan, 2001: New country record and geographic distribution map, Venezuela. CheckList 6(3) 463-64.
- Smith, E. N. and B. P. Noonan. (2001). A new species of Osteocephalus (Anura: Hylidae) from Guyana. Revista de Biología Tropical 49(1) 347-57.
- Reynolds, R., et al. 2004. Osteocephalus exophthalmus. The IUCN Red List of Threatened Species. Version 2014.2. Downloaded on 3 October 2014.
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