Conservative estimate of the distribution of G. evgoodei in Mexico indicated by diagonal lines. Desert tortoise range limit, modified based on our field sampling, from Germano et al. (1994). Squares indicate museum and literature records of occurrence of G. spp. Circles are sample locations from Edwards et al. (2015) for both G. morafkai (black) and G. evgoodei (white). Localities in the Sinaloan thornscrub-Sonoran desertscrub ecotone indicated by split circles, which indicate the occurrence of both G. evgoodei and G. morafkai genotypes and/or hybrids.