Thorius lunaris (common name: crescent-nostriled thorius) is a species of salamander in the family Plethodontidae. It is endemic to Pico de Orizaba, in Veracruz, Mexico, at elevations of 2,500–2,640 m (8,200–8,660 ft) asl. Its natural habitat is pine-oak forest where it occurs under the bark of stumps and fallen logs, in leaf-litter, and in piles of wood chips. This was formerly very abundant species is now very rare. It is threatened by habitat loss caused by logging and expanding agriculture.