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]

Page 24869


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.