Pecos assiminea Assiminea pecos is a tiny (< 2.1 mm) snail with a distribution limited to Chaves County, New Mexico and Pecos County, Texas. The species has been federally listed as endangered since 2005. Bitter Lakes National Wildlife Refuge is one of the few strongholds of Pecos assiminea, but knowledge of its distribution and habitat use remains incomplete. Furthermore without viable survey techniques, the status of the species and the impacts of habitat restoration activities cannot be determined. The recovery plan for Pecos assiminea calls for developing a technique to monitor its abundance, thus our primary and secondary objectives are to evaluate two surveying techniques, quadrat and wood tile sampling, for determining Pecos assiminea distribution, density, and habitat associations and to evaluate the effect of common reed removal on a suite of endangered species including Pecos assiminea, two springsnails and an amphipod (Pyrgulopsis roswellensis, Juturnia kosteri, Gammarus desparatus, respectively).