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DOI/FWS RIN: 1018-AV93 Publication ID: Fall 2011 
Title: Endangered and Threatened Wildlife and Plants; Listing Determinations for Spectaclecase and Sheepnose Mussels 
Abstract: We are making determinations regarding listing spectaclecase and sheepnose mussels under the Endangered Species Act. The sheepnose mussel is currently found in 26 tributary streams and mainstems of the Upper Mississippi, Lower Missouri, Ohio, Cumberland, Tennessee, and Lower Mississippi River systems. The spectaclecase mussel is currently known to occur in 20 streams in 10 States; however, 7 of the 20 extant populations are represented by only a single known specimen each and are likely not viable. Reproducing spectaclecase populations exist in the Meramec and Gasconade Rivers in Missouri, in the St. Croix River bordering Minnesota and Wisconsin, and in the Upper Clinch River in Tennessee. 
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 USC 1531 et seq   
Legal Deadline:  None
Timetable:
Action Date FR Cite
NPRM  01/19/2011  76 FR 3392   
NPRM Comment Period End  03/21/2011    
Final Action  04/00/2012    
Regulatory Flexibility Analysis Required: No  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