Pristimantis spinosus is a species of frog in the family Strabomantidae. It is a small brown-backed frog with postorbital dermal folds, its belly is cream to black, and the posterior surfaces of its thighs and groin are black with white dots. It is found in Ecuador and possibly Peru. Its natural habitat is tropical moist montane forests. It is threatened by habitat loss. References spinosus Endemic fauna of Ecuador Amphibians of Ecuador Amphibians of the Andes Amphibians described in 1979 Taxonomy articles created by Polbot