USFWS proposes to list the Pecos pupfish (Cyprinodon pecosensis), a fish species from the Pecos River Basin of New Mexico and Texas, as a threatened species and designate critical habitat under the ESA. This determination also serves as their 12-month finding on a petition to list the Pecos pupfish. 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 Pecos pupfish as a threatened species with a rule issued under section 4(d) of the Act ("4(d) rule"). If finalized the Pecos pupfish would be added to the List of Endangered and Threatened Wildlife and the Act's protections would be extended to the species. They also announce the availability of an economic analysis of the proposed designation of critical habitat for Pecos pupfish. They will accept comments received or postmarked on or before 21 January 2025. POC is Shawn Sartorius, Field Supervisor, USFWS, New Mexico Ecological Services Field Office, 2105 Osuna NE, Albuquerque, NM 87113; tele 505-697-7606. (Federal Register 22 Nov 2024 [Proposed Rule] Pages 92744-92785).