Great Basin Naturalist


The status of the genus Urosaurus Hallowell and its relationship to the genus Uta Baird and Girard as presented in previous studies are reviewed. Additional data from the head and throat osteology and myology are included in the analysis. Each bone and muscle is measured, ratios determined, and the position noted. Five distinct anatomical differences are noted between Uta and Urosaurus, and it is concluded that both of these genera are sufficiently different to warrant generic status. Uta is considered to be phylogenetically more primitive.