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DOI/FWS RIN: 1018-BD55 Publication ID: Fall 2021 
Title: Endangered and Threatened Wildlife and Plants; Critical Habitat Designation for the Texas Hornshell 

This final rule will make a determination on our proposal to designate critical habitat for the Texas hornshell (Popenaias popeii), a freshwater mussel, under the Endangered Species Act of 1973, as amended (Act). In total, the proposed critical habitat designation includes approximately 463.6 river miles (745.9 kilometers) in Eddy County, New Mexico, and in Culberson, Brewster, Terrell, Val Verde, Kinney, Maverick, and Webb Counties, Texas. If FWS finalizes this rule as proposed, it would extend the Act’s protections to this species’ critical habitat as described in the proposed rule.

Agency: Department of the Interior(DOI)  Priority: Substantive, Nonsignificant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Final Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 50 CFR 17   
Legal Authority: 16 U.S.C. 1531 et seq.   
Legal Deadline:  None
Action Date FR Cite
NPRM  06/10/2021  86 FR 30888   
NPRM Comment Period End  08/09/2021 
Final Action  06/00/2022 
Regulatory Flexibility Analysis Required: No  Government Levels Affected: Federal 
Federalism: No 
Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
Caitlin Snyder
Branch of Domestic Listing, Ecological Services Program
Department of the Interior
United States Fish and Wildlife Service
5275 Leesburg Pike, MS: ES,
Falls Church, VA 22041-3803
Phone:703 358-2673
Fax:703 358-1800