Endangered and Threatened Wildlife and Plants; 12-Month Finding for Purple Lilliput; Threatened Species Status With Section 4(d) Rule for Longsolid and Round Hickorynut and Designation of Critical Habitat

We, the U.S. Fish and Wildlife Service (Service), announce 12- month findings on a petition to list the purple lilliput (Toxolasma lividum), longsolid (Fusconaia subrotunda), and round hickorynut (Obovaria subrotunda) freshwater mussels as endangered or threatened species and to designate critical habitat under the Endangered Species Act of 1973, as amended (Act). We find that listing the longsolid and round hickorynut is warranted. Accordingly, we propose to list the longsolid and round hickorynut as threatened species with a rule issued under section 4(d) of the Act (``4(d) rule''). If we finalize this rule as proposed, it would add these species to the List of Endangered and Threatened Wildlife and extend the Act's protections to the species. We also propose to designate critical habitat for the longsolid and round hickorynut under the Act. For the longsolid, approximately 1,115 river miles (1,794 kilometers), all of which is occupied by the species, in Pennsylvania, Kentucky, West Virginia, Virginia, Tennessee, and Alabama fall within the boundaries of the proposed critical habitat designation. For the round hickorynut, approximately 921 river miles (1,482 kilometers), all of which is occupied by the species, in Pennsylvania, Ohio, Indiana, Kentucky, West Virginia, Tennessee, Alabama, and Mississippi fall within the boundaries of the proposed critical habitat designation. Finally, we announce the availability of a draft economic analysis of the proposed designation of critical habitat for the longsolid and round hickorynut. After a thorough review of the best available scientific and commercial information, we find that it is not warranted at this time to list the purple lilliput. We ask the public to submit to us at any time new information relevant to the status of purple lilliput or its habitat.