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DOI/FWS RIN: 1018-AY16 Publication ID: Fall 2011 
Title: ●Endangered and Threatened Wildlife and Plants; Listing Determination and Critical Habitat Designation for the Grotto Sculpin 
Abstract: We will make a listing determination and designate critical habitat for the grotto sculpin (Cottus spp.) pursuant to the Endangered Species Act. The sculpin, a cave-dwelling fish, is restricted to two karst areas (limestone regions characterized by sink holes, abrupt ridges, caves, and underground streams), the Central Perryville Karst and Mystery-Rimstone Karst, in Perry County, southeast Missouri. The current overall range of the grotto sculpin has been estimated to encompass approximately 260 square kilometers (100 square miles). The small population size and endemism of the grotto sculpin make it vulnerable to extinction due to genetic drift, inbreeding depression, and random or chance changes to the environment. Current threats to the habitat of the grotto sculpin may exacerbate potential problems associated with its low population numbers and increase the likelihood of extinction. 
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  08/00/2012    
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