DistributionRead full entry
Range DescriptionOccurs restricted to a series of disjunct isolated basins collectively known as the Bolson de Mapimi of south-eastern Chihuahua, western Coahuila and northern Durango, Mexico (Aguirre in Groombridge 1982, Morafka et al. 1989, Iverson 1992).
The Bolson de Mapimi covers about 40,000 sq. km; the total geographic range of G. flavomarginatus measures about 150 km across, and the area of occupancy is about 7,000 sq. km (Morafka 1982, Morafka et al. 1989).
The past distribution of the species was much wider - Pleistocene fossils indicate occurrence as far away as south-western Arizona and Oklahoma, US, and Aguascalientes, Mexico (Morafka 1982, Morafka et al. 1989).