Designation of Critical Habitat for Six West Texas Aquatic Invertebrates: Final Rule.

We, the U.S. Fish and Wildlife Service, designate critical habitat for the following six west Texas aquatic invertebrate species under the Endangered Species Act of 1973, as amended: Phantom springsnail (Pyrgulopsis texana), Phantom tryonia (Tryonia cheatumi), diminutive amphipod (Gammarus hyalleloides), Diamond tryonia (Pseudotryonia adamantina), Gonzales tryonia (Tryonia circumstriata), and Pecos amphipod (Gammarus pecos). The effect of this regulation is to conserve critical habitat for the six west Texas aquatic invertebrates under the Act.