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The desert pocket mouse (Chaetodipus penicillatus) comprises 6 nominate subspecies that occupy warm, sandy desert-scrub habitats across the Mojave and Sonoran deserts. The most thorough morphological assessment within the species noted variable levels of distinctiveness, leading to uncertainty regarding the geographic distributions of subspecies. Subsequent genetic assessments using chromosomal, allozymic, and mitochondrial DNA (mtDNA) sequence data detected a general east?west divergence centered on the Colorado River, but few locations were included in these assessments. We investigated phylogeographic structure in C. penicillatus by sequencing regions of mtDNA for 220 individuals from 51 locations representing...
The geographic pattern of variation in Cnemidophorus tigris septentrionalis Burger was determined from 17 samples (664 specimens) drawn from populations distributed throughout its range. Principal components analysis and canonical variates analysis identified three groups of populations whose morphological differences coincide with three geographic areas: (A) north of the Colorado and Dolores rivers in northwestern Arizona, east-central Utah, and western Colorado; (B) south of the Colorado and San Juan rivers and east of the Little Colorado River in southeastern Utah, northwestern New Mexico, and northeastern Arizona; and (C) west of the Little Colorado River in northeastern Arizona. The latter population is of...