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DOI/FWS RIN: 1018-AY06 Publication ID: Fall 2011 
Title: ●Endangered and Threatened Wildlife and Plants; Listing Determination and Critical Habitat Designation for two Tennessee River Mussels 
Abstract: We will make a listing determination and designate critical habitat for two Tennessee river mussels--fluted kidneyshell and slabside pearlymussel (Ptychobranchus subtentum and Lexingtonia dolabelloides)--pursuant to the Endangered Species Act of 1973. We will propose to list as endangered or threatened, and 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, 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: First time 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  09/00/2012    
Regulatory Flexibility Analysis Required: Undetermined  Government Levels Affected: Undetermined 
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