Amphibians
Valdina Farms Salamander
Eurycea troglodytes · also called Valdina Farms salamanders
Within a cave sinkhole in Medina County that quarrying had already reshaped before scientists ever documented what lived inside it, a Valdina Farms salamander continues its entirely aquatic existence in groundwater that has flowed through this same altered system for generations.
Overview
The Valdina Farms salamander, Eurycea troglodytes, is a fully aquatic, cave-dwelling salamander known only from a limited cave and sinkhole system in Medina County, central Texas. Its history of habitat disturbance from nearby quarrying and extraordinarily narrow range make it one of the more precariously positioned cave amphibians in the Edwards Plateau region.
A species discovered in an already-altered home
Rather than being found in pristine cave habitat, the Valdina Farms salamander’s very discovery came from a site quarrying had already reshaped, a species whose entire known existence has unfolded within human-disturbed groundwater from the start.
Status
Vulnerable — confined to a limited cave and sinkhole system in central Texas, with a history of disturbance from nearby quarrying activity.
Valdina Farms Salamander: common questions
Why was the Valdina Farms salamander's habitat already disturbed when it was discovered?
The Valdina Farms salamander was first scientifically described from specimens found in a sinkhole cave system that had already been physically altered by nearby quarrying activity, meaning the species' known habitat has carried a history of human disturbance since essentially the moment it was first documented.
Does the Valdina Farms salamander ever leave the water?
No, a Valdina Farms salamander retains external gills throughout its entire life and never undergoes metamorphosis into a land-dwelling adult, remaining fully aquatic within its cave and groundwater habitat for its whole lifespan.
Is the Valdina Farms salamander related to other Texas cave salamanders?
Yes, the Valdina Farms salamander belongs to the same broader group of Eurycea salamanders found across the Edwards Plateau region of central Texas, alongside several other species similarly restricted to individual cave or spring systems, such as the Cascade Caverns salamander.
Where does the Valdina Farms salamander live?
The Valdina Farms salamander is known only from a limited cave and sinkhole system in Medina County, central Texas, making it endemic to this single, narrow location.