Threatened Species Status for the Headwater Chub and a Distinct Population Segment of the Roundtail Chub; Proposed rule; reopening of the comment period.

We, the U.S. Fish and Wildlife Service (Service), announce the comment period reopening on our proposed rules to add the headwater chub (Gila nigra) and the roundtail chub (Gila robusta) distinct population segment (DPS) as threatened species to the List of Endangered and Threatened Wildlife. We are taking this action based on significant new information regarding the species' taxonomic status as presented by the American Fisheries Society and the American Society of Ichthyologists and Herpetologists (AFS/ASIH) Joint Committee on the Names of Fishes. We are reopening the comment period for 45 days to provide the public additional time to review and consider our proposed rulemakings in light of this new information.