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Endangered Species

Williamson County is home to five species that are listed as endangered and two threatened species.

Three of the endangered species are karst invertebrates that live in karst areas.  A karst is the name for the honeycomb type limestone formations (including caves, sinkholes and fissures) that are typical in limestone geology.

Bone Cave harvestman Tooth Cave Ground Beetle
  • The Bone Cave harvestman (Texella reyesi) is found primarily in Williamson County.
  • The Tooth Cave Ground Beetle (Rhadine persephone) is a tiny, reddish-brown beetle that spends its entire life underground.
  • The Coffin Cave mold beetle (Batrisodes texanus) is a small, long-legged beetle that lives in total darkness and has no eyes.  This beetle is found only in Williamson County.

Karst Invertebrates Brochure

Two endangered birds also nest in Williamson County.

golden-cheeked warbler black-capped virco
  • The golden-cheeked warbler (Setophaga chrysoparia) is a migratory songbird that builds nests of Ashe juniper bark (commonly referred to as cedar) in areas with mixed hardwoods.  They winter in Central America but nest and breed only in Texas.
  • The black-capped vireo (Vireo atricapillus) is another migratory songbird that builds its nests just a few feet from the ground in brushy, transitional habitat. (As of 12/12/16 the US Fish and Wildlife Service has proposed de-listing this species. For additional information see

georgetown salamander


The Georgetown Salamander (Eurycea naufragia) is threatened species in the county. At approximately the same time the Jollyville Plateau salamander (Eurycea tonkawae) was also classified as threatened. The Georgetown Salamander is protected through a 4(d) Special Take Provision of the Endangered Species Act. Information regarding the 4(d) rule may be found here:


Logo for the Williamson County Conservation Fund
The Foundation
About The WCCF

Conservation Foundation
219 Perry Mayfield
Leander, TX, 78641
Phone: (512) 943-1921
Driving Directions

Gary Boyd
Environmental Program Coordinator
Phone: (512) 943-1921

Pct. 3 Commissioner
Valerie Covey
WCCF Board President
3010 Williams Drive, Ste. 153
Georgetown, TX 78628
Phone: (512) 943-3370

For Media Inquires:

Connie Watson
Public Information Officer
Phone: (512) 943-1663

Williamson County Courthouse
710 Main Street Georgetown, TX 78626
Main Telephone: (512)943-1100
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