Amphibians
Comal Springs Salamander
Eurycea sp. · also called Comal Springs salamanders
Beneath the clear outflow of a single Texas spring system, a Comal Springs salamander drifts through water that has travelled from deep within the Edwards Aquifer, occupying a range so narrow that its entire known population depends on one uninterrupted source of flow.
Overview
The Comal Springs salamander, genus Eurycea, is a fully aquatic, gilled salamander known only from the Comal Springs system in New Braunfels, Texas. Its dependence on a single spring source and its likely presence deep within the surrounding aquifer make it one of the most narrowly restricted and least understood salamander species in North America.
A species defined by a single water source
Where most animals can shift habitat in response to changing conditions, the Comal Springs salamander has nowhere else to go, its entire existence tied to the continued, uninterrupted flow of one specific spring system.
Status
Endangered — confined entirely to the Comal Springs system, highly vulnerable to any reduction in spring flow from drought or groundwater pumping.
Comal Springs Salamander: common questions
Why is the Comal Springs salamander so vulnerable?
The Comal Springs salamander is known only from a single spring system in New Braunfels, Texas, an extraordinarily narrow range that leaves it with no alternative habitat if spring flow is significantly reduced by drought or groundwater pumping, unlike a more widely distributed species that could shift to nearby habitat under similar pressure.
Does the Comal Springs salamander ever leave the water?
No, the Comal Springs salamander is paedomorphic, retaining external gills and remaining fully aquatic even as a sexually mature adult, never developing into a lunged, terrestrial form the way many other salamander species eventually do.
Why is it hard to know exactly how many Comal Springs salamanders exist?
Individuals may spend considerable time deep within the underlying Edwards Aquifer karst system rather than only in the visible spring outflows that researchers can directly survey, meaning the true population likely extends well beyond what can actually be counted or observed at the surface.
What is the biggest threat to the Comal Springs salamander?
Because the species depends entirely on consistent flow from the Comal Springs system, any significant reduction in spring flow caused by drought or excessive groundwater pumping from the Edwards Aquifer poses a direct and immediate threat, since the salamander has no alternative habitat anywhere else to retreat to.