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DOI/FWS RIN: 1018-AY06 Publication ID: 2012 
Title: Endangered and Threatened Wildlife and Plants; Listing Determination and Critical Habitat Designation for Two Tennessee River Mussels 
Abstract: We propose to list two Tennessee river mussels--fluted kidneyshell and slabside pearlymussel (Ptychobranchus subtentum and Lexingtonia dolabelloides)--as endangered pursuant to the Endangered Species Act of 1973. We also propose to designate critical habitat for these two freshwater mussels, which are endemic to the Tennessee and Cumberland River systems in Tennessee, Kentucky, Virginia, Alabama, and Mississippi. Once widely distributed, the fluted kidneyshell is now limited to 12 locations, and the slabside pearlymussel is found in only 10 sites. These species depend on clear, clean, and free-flowing shoal habitat and the presence of host fish for reproduction. Major threats include impoundment (dams), environmental contaminants, sedimentation, and direct loss of habitat. 
Agency: Department of the Interior(DOI)  Priority: Substantive, Nonsignificant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 50 CFR 17   
Legal Authority: 16 USC 1531 et seq   
Legal Deadline:  None
Timetable:
Action Date FR Cite
NPRM  10/04/2012  77 FR 60804   
NPRM Comment Period End  12/03/2012 
NPRM Comment Period Reopened  02/00/2013 
Final Action  10/00/2013 
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:
Sarah Quamme
Chief, 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:703 358-1796
Fax:703 358-1800
Email: sarah_quamme@fws.gov