Thorius dubitus (common name: Acultzingo pigmy salamander) is a species of salamander in the family Plethodontidae. It is endemic to Mexico where it is found in west-central Veracruz and adjacent Puebla. Its natural habitats are pine-oak cloud forests. It occurs under wood chips, logs, and rocks, and under the bark of logs and inside logs. It is threatened by habitat loss caused by logging, livestock, and subsistence agriculture.
- Gabriela Parra-Olea; David Wake; James Hanken (2008). "Thorius dubitus". IUCN Red List of Threatened Species. Version 2015.2. International Union for Conservation of Nature. Retrieved 11 July 2015.
- Frost, Darrel R. (2015). "Thorius dubitus Taylor, 1941". Amphibian Species of the World: an Online Reference. Version 6.0. American Museum of Natural History. Retrieved 11 July 2015.
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