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 Sceloporus utiformis Cope (Cope's largescale spiny lizard) Specimens analysed: three males (CEAC 12, CEAC13, CAEC14) Distribution: Mexican endemic. It is distributed along the Pacific slope from southern Sinaloa to western Guerrero. Subspecies: no subspecies have been described. Karyotype and DNA taxonomy: the karyotype for this species has been described from two specimens, one male and one female, both from Jalisco in a locality (northwest of Puerto Los Mazos) about 70 Km from Chamela ( Cole 1971 ). The diploid number was 2n = 34 and the male carried a heteromorphic pair of microchromomes that were not present in the female. This polymorphism has been interpreted as a XY sex chromosomal system ( Cole 1971 ). The specimens analysed in this study show a karyotype identical to the one previously reported ( Fig. 7 ). It is composed of 12 biarmed chromosomes and 22 microchromosomes. In these male individuals one of the microchromosomes is very small. Therefore we confirm the presence of a XY sex chromosome system in this species. The rDNA 16S has been studied for a single specimen from Jalisco (Boca de Iguanas), which is near the locality for specimens in the present study ( Wiens & Reeder 1997 ; Flores-Villela et al. 2000 ). The from Chamela differ by 3% from the previous studied sample, which is a low value of divergence consistent with an intraspecific divergence.