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Federal Register / Vol. 86, No. 157 / Wednesday, August 18, 2021 / Rules and Regulations
Ecological Services Field Office see FOR
FURTHER INFORMATION CONTACT.
Authors The primary authors of this rule are the staff members of the Services Austin Ecological Services Field Office.
List of Subjects in 50 CFR Part 17

Regulation Promulgation Accordingly, we amend part 17, subchapter B of chapter I, title 50 of the Code of Federal Regulations, as set forth below:
PART 17ENDANGERED AND
THREATENED WILDLIFE AND PLANTS
1. The authority citation for part 17
continues to read as follows:

Endangered and threatened species, Exports, Imports, Reporting and recordkeeping requirements, Transportation.
Common name

AMPHIBIANS

Wherever found

T

Salamander, Salado

Eurycea chisholmensis

Wherever found

T

3. Amend 17.95 in paragraph d by adding entries for Georgetown Salamander Eurycea naufragia and Salado Salamander Eurycea chisholmensis in the same order that these species appear in the table at 17.11h to read as follows:

17.95

Critical habitatfish and wildlife.

d

Georgetown Salamander Eurycea naufragia 1 Critical habitat units are depicted for Williamson County, Texas, on the maps in this entry.
2 Within these areas, the physical or biological features essential to the conservation of Georgetown salamander consist of the following components:
i For surface habitat:
A Water from the Northern Segment of the Edwards Aquifer. Groundwater issuing to the surface from the underlying aquifer is similar to natural aquifer conditions as it discharges from natural spring outlets. Concentrations of water quality constituents and contaminants should be below levels that could exert direct lethal or sublethal effects such as effects to reproduction, growth, development, or metabolic processes, or indirect effects such as effects to the Georgetown salamanders prey base. Hydrologic regimes similar to the historical pattern of the specific sites are present, with at
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least some surface flow during the year.
The water chemistry of aquatic surface habitats is similar to natural aquifer conditions, with temperatures from 61
to 84 F 16 to 29 C, dissolved oxygen concentrations from 5 to 13 milligrams per liter mg/L, and specific water conductance from 317 to 814 microSiemens per centimeter mS/cm.
B Rocky substrate with interstitial spaces. Rocks in the substrate of the salamanders surface aquatic habitat are large enough to provide salamanders with cover, shelter, and foraging habitat.
The substrate and interstitial spaces have minimal sedimentation.
C Aquatic invertebrates for food. The spring environment supports a diverse aquatic invertebrate community that includes crustaceans, insects, and aquatic snails.
D Subterranean aquifer. Access to the subsurface water table exists to provide shelter, protection, and space for reproduction. This access can occur in the form of large conduits that carry water to the spring outlet or porous voids between rocks in the streambed that extend down into the water table.
ii For subsurface habitat:
A Water from the Northern Segment of the Edwards Aquifer. Groundwater quality is similar to natural aquifer conditions. Concentrations of water quality constituents and contaminants should be below levels that could exert direct lethal or sublethal effects such as effects to reproduction, growth,
PO 00000

Listing citations and applicable rules

Eurycea naufragia

h

Status

Salamander, Georgetown.

jbell on DSKJLSW7X2PROD with RULES2

Where listed
17.11 Endangered and threatened wildlife.

Authority: 16 U.S.C. 13611407; 1531
1544; and 42014245, unless otherwise noted.

Scientific name
2. Amend 17.11 in paragraph h by revising the entries for Salamander, Georgetown and Salamander, Salado in the List of Endangered and Threatened Wildlife under AMPHIBIANS to read as follows:

development, or metabolic processes, or indirect effects such as effects to the Georgetown salamanders prey base.
Hydrologic regimes similar to the historical pattern of the specific sites are present, with continuous flow. The water chemistry is similar to natural aquifer conditions, with temperatures from 61 to 84 F 16 to 29 C, dissolved oxygen concentrations from 5 to 13 mg/
L, and specific water conductance from 317 to 814 mS/cm.
B Subsurface spaces. Voids between rocks underground are large enough to provide salamanders with cover, shelter, and foraging habitat. These spaces have minimal sedimentation.
C Aquatic invertebrates for food. The habitat supports an aquatic invertebrate community that includes crustaceans, insects, and aquatic snails.
3 Surface critical habitat includes the spring outlets and outflow up to the high-water line and 262 feet ft 80
meters m of upstream and downstream habitat, including the dry stream channel during periods of no surface flow. The surface critical habitat does not include manmade structures such as buildings, aqueducts, runways, roads, and other paved areas existing within the legal boundaries on September 17, 2021; however, the subsurface critical habitat may extend below such structures. The subsurface critical habitat includes underground features in a circle with a radius of 984
ft 300 m around the springs.

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