USFWS proposes to list the southern elktoe (Alasmidonta triangulata), a freshwater mussel species endemic to the Apalachicola-Chattahoochee-Flint Basin of Alabama, Georgia, and Florida, as an endangered species and designate critical habitat under the ESA. This determination also serves as their 12-month finding on a petition to list the southern elktoe. After a review of the best available scientific and commercial information, they find that listing the species is warranted. Accordingly, they propose to list the southern elktoe as an endangered species under the Act. They also propose to designate critical habitat for the southern elktoe under the Act. They will accept comments received or postmarked on or before 21 August 2023. POC is Lourdes Mena, Florida Classification and Recovery Division Manager, USFWS, Florida Ecological Services Field Office, 7915 Baymeadows Way, Suite 200, Jacksonville, FL 32256–7517; tele: 904–731–3134. (Federal Register 21 June 2023 [Proposed Rule] Pages 40160-40189).