Thorius macdougalli, commonly known as MacDougall's pigmy salamander, is a species of salamander in the family Plethodontidae. It is endemic to Oaxaca, Mexico, and is known from Cerro de Humo (its type locality) and Sierra de Juárez. Its natural habitat is pine-oak forest, but it also occurs in degraded habitats. It is threatened by habitat loss caused by clear-cutting and livestock grazing.

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