The U.S. Fish and Wildlife Service (Service), proposes to list the green floater ( Lasmigona subviridis), a mussel species from as many as 10 States in the eastern United States and the District of Columbia, as a threatened species with a rule issued under section 4(d) of the Endangered Species Act of 1973, as amended (Act). This document also serves as their 12-month finding on a petition to list the green floater. They also propose to designate critical habitat for the green floater. In total, approximately 2,553 kilometers (1,586 miles) of streams in Maryland, New York, North Carolina, Pennsylvania, Virginia, and West Virginia fall within the boundaries of the proposed critical habitat designation. They also announce the availability of a draft economic analysis of the proposed designation of critical habitat for the green floater. If finalized as proposed, this rule would add this species to the List of Endangered and Threatened Wildlife. The Service will accept comments received or postmarked on or before 25 September 2023. POC is Ian Drew, tele 607-753-9334. citation(Federal Register 26 July 2023 [Proposed Rule] Pages 48294-48349)