Ischnocnema guentheri is a species of frog in the family Brachycephalidae. It is found in Argentina, Brazil, and possibly Paraguay. Its natural habitats are subtropical or tropical moist lowland forest and subtropical or tropical moist montane forest. It is threatened by habitat loss. References guentheri Amphibians of Argentina Amphibians of Brazil Taxonomy articles created by Polbot Amphibians described in 1864