Nymphargus siren (common name: Rio Coca Cochran frog) is a species of frog in the family Centrolenidae, formerly placed in Cochranella. It is found in Colombia, Ecuador, and Peru. Its natural habitats are pre-montane forests near streams. It is threatened by habitat loss. Adult males of Nymphargus siren measure in snout–vent length. Snout is truncate and dorsal skin is shagreen with spinules. References siren Amphibians of Colombia Amphibians of Ecuador Amphibians of Peru Taxonomy articles created by Polbot Amphibians described in 1973