Elongate mud meadows springsnail (Pyrgulopsis notidicola)
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[Federal Register: May 11, 2005 (Volume 70, Number 90)] [Proposed Rules] [Page 24869-24934] From the Federal Register Online via GPO Access [wais.access.gpo.gov] [DOCID:fr11my05-19] Page 24869 DEPARTMENT OF THE INTERIOR Fish and Wildlife Service 50 CFR Part 17 Endangered and Threatened Wildlife and Plants; Review of Native Species That Are Candidates or Proposed for Listing as Endangered or Threatened; Annual Notice of Findings on Resubmitted Petitions; Annual Description of Progress on Listing Actions AGENCY: Fish and Wildlife Service, Interior. ACTION: Notice of review. ... Elongate mud meadows springsnail (Pyrgulopsis notidicola)--The following summary is based on information contained in our files. No new information was provided in the petition received on May 11, 2004. Pyrgulopsis notidicola is endemic to Soldier Meadow, which is located at the northern extreme of the western arm of the Black Rock Desert, in the transition zone between the Basin and Range Physiographic Province and the Columbia Plateau Province, Humboldt County, Nevada. The type locality, and the only known location of the species, occurs in a stretch of thermal (between 45[deg] Celsius (C) (113[deg] Fahrenheit (F)) and 32[deg] C (90[deg] F)) aquatic habitat that is approximately 300 m (984 ft) long and 2 m (6.7 ft) wide. Pyrgulopsis notidicola occurs only in shallow, flowing water on gravel substrate. The species does not occur in deep water (i.e., impoundments) where water velocity is low, gravel substrate is absent, and sediment levels are high. The present or threatened destruction, modification, or curtailment of its habitat or range by recreational bathers in the thermal waters is the greatest threat to the species. The small size of their habitat and their limited range makes them highly susceptible to any factors that negatively impact their habitat. Regulatory mechanisms are beginning to be put in place, but few actions have been implemented to date. Based on imminent threats of high magnitude, we retain a listing priority number of 2 for this species.