Thorius infernalis, commonly known as the Atoyac minute salamander, is a species of salamander in the family Plethodontidae. It is endemic to Mexico where it is only known from its type locality in the Sierra Madre del Sur mountains in central Guerrero. Its natural habitat is riparian vegetation along hillsides, presumably in forest. Much of the potential habitat is already converted into coffee plantations. It is threatened by habitat loss caused by expanding agriculture and human settlements. References Thorius Endemic amphibians of Mexico Fauna of the Sierra Madre del Sur Amphibians described in 1999 Taxonomy articles created by Polbot