ETWP; Listing Roswell springsnail, Koster's tryonia, Pecos assiminea, and Noel's amphipod as Endangered With Critical Habitat

We, the U.S. Fish and Wildlife Service (Service), propose to list the Roswell springsnail (Pyrgulopsis roswellensis), Koster's tryonia (Tryonia kosteri), Pecos assiminea (Assiminea pecos), and Noel's amphipod (Gammarus desperatus) as endangered with critical habitat under the Endangered Species Act of 1973, as amended (Act) (16 U.S.C. 1531 et seq.). These species occur at sinkholes, springs, and associated spring runs and wetland habitats. They are found at two sites in Chaves County, NM, one site in Pecos County, TX, and one site in Reeves County, TX. Pecos assiminea is also known from one area in Coahuila, Mexico. These three snails and one amphipod have an exceedingly limited distribution and are imperiled by local and regional groundwater depletion, surface and groundwater contamination, oil and gas extraction activities within the supporting aquifer and watershed, and direct loss of their habitat (e.g., through burning or removing marsh vegetation, cementing, or filling of habitat). This proposal, if made final, will implement the Federal protection and recovery provisions of the Act for these invertebrate species.