The US Fish and Wildlife Service's (USFWS) decision not to list the flat-tailed horned lizard as an endangered species has been posted online, and a PDF copy is available below via scribd. The lizard inhabits sandy hardpan or gravel flats in the Coachella Valley and Sonoran Desert, which lies south of the Mojave Desert ecosystem.
The assessment confirms that the Coachella Valley population of the flat-tailed horned lizard will likely see significant threats within the foreseeable future, and admits that the Coachella Valley Habitat Conservation Plan has not yet preserved the lizard's last remaining habitat in the area. Nonetheless, because of conservation and land management efforts throughout the rest of its range, the USFWS believes the species remains viable and does not warrant endangered status.
FTHL ruling FWS-R8-ES-2010-0008-0042