USFWS proposes to list the Quitobaquito tryonia (Tryonia quitobaquitae), a springsnail species from Arizona, as an endangered species under the ESA. This determination also serves as their 12-month finding on a petition to list the Quitobaquito tryonia. After a review of the best available scientific and commercial information, they find that listing the species is warranted. We also propose to designate critical habitat for the Quitobaquito tryonia under the Act. In total, approximately 6,095 square feet (566 square meters) across 2 subunits in Pima County, Arizona, fall within the boundaries of the proposed critical habitat designation. They also announce the availability of a draft economic analysis (DEA) of the proposed designation of critical habitat for Quitobaquito tryonia. If finalize this rule would extend the Act's protections to this species and its designated critical habitat. They will accept comments received or postmarked on or before 13 November 2023. POC is Heather Whitlaw, Field Supervisor, USFWS, Arizona Ecological Services Field Office, 9828 North 31st Ave #C3, Phoenix, AZ 85051–2517; tele 602–242–0210. (Federal Register 13 September 2023 [Proposed Rule] Pages 62725-62747)