Cytotaxonomy and DNA taxonomy of lizards (Squamata, Sauria) from a tropical dry forest in the Chamela-Cuixmala Biosphere Reserve on the coast of Jalisco, Mexico Author Castiglia, Riccardo Author Annesi, Flavia Author Bezerra, Alexandra M. R. Author García, Andrés Author Flores-Villela, Oscar text Zootaxa 2010 2508 1 29 journal article 10.5281/zenodo.196005 4a013300-d475-4db9-a5cf-bff30510ac4a 1175-5326 196005 Genus Urosaurus Hallowell The genus includes nine species distributed in the southwestern United States of America and western Mexico , from southern Wyoming to northern Mexico along the border of USA and Mexico , and on the Pacific coast from Sonora, south entering the Balsas Basin to eastern Chiapas. Phylogenetic relationships between species have been assessed only on morphological grounds and with a single allozyme character by Wiens (1993) . Only three species have been karyotyped: U. graciosus ( Hall 1965 ; Gorman 1973 ), U. nigricaudus (Gorman et al. 1969) , and U. ornatus ( Porter et al. 1994 ) . All these species have a similar karyotype, 2n = 34, with 12 macrochromosomes of metacentric morphology and 22 microchromosomes.