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The Hell Hollow slender salamander (Batrachoseps diabolicus) is a species of salamander in the Plethodontidae family. It is endemic to California, in Merced County in the western United States.
Hell Hollow slender salamander Wikipedia
This salamander is endemic to the watersheds of the Merced River through to the American River, at elevations below 300 metres (980 ft), on the western slope of the Sierra Nevada.
The Hell Hollow slender salamander is an IUCN Red List Vulnerable species.