On July 8, 2013, the U.S. Fish and Wildlife Service made critical habitat designations for six west Texas aquatic invertebrate species under the Endangered Species Act. These species, which were listed as endangered in the July 9, 2013 Federal Register, are: 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 designated critical habitat units are the San Solomon Spring, the Giffin Spring, and the East Sandia Spring in Reeves County; the Phantom Lake Spring in Jeff Davis County; and the Diamond Y Spring System in Pecos County. Additional information on this action is in the July 9, 2013 issue of the Federal Register.