Field Notes
U.S. Fish & Wildlife Service
Field Notes Entry   
Final Rule Listing the Roswell springsnail, Koster's springsnail, and Noel's amphipod as endangered
Southwest Region, August 1, 2005
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On August 1, 2005, the Service published the final rule listing the Roswell springsnail (Pyrgulopsis roswellensis), Koster's springsnail (Juturnia kosteri), and Noel's amphipod (Gammarus desperatus) as endangered and the Pecos assiminea (Assiminea pecos) as endangered with critical habitat under the Endangered Species Act of 1973, as amended (Act). These four invertebrates occur at sinkholes, springs, and associated spring runs and wetland habitats. They are found at one site in Chaves County, New Mexico, and Pecos assiminea is also found at one site in Pecos County, Texas, and one site in Reeves County, Texas. These three snails and one amphipod have an exceedingly limited distribution, low mobility, and fragmented habitat. They are imperiled by introduced species, surface and groundwater contamination, oil and gas extraction activities within the supporting aquifer and watershed, local and regional groundwater depletion, severe drought, and direct loss of their habitat (e.g., through burning or removing marsh vegetation, or flooding of habitat). This final rule will implement the Federal protection and recovery provisions of the Act for these invertebrate species. Section 7 of the Act requires Federal agencies to ensure that actions they authorize, fund, or carry out are not likely to jeopardize the continued existence of these species or destroy or adversely modify designated critical habitat. As required by section 4 of the Act, we considered public comments and economic and other relevant impacts prior to making a final decision on what areas to designate as critical habitat.

Contact Info: Martin Valdez, 505-248-6599, martin_valdez@fws.gov
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