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The Southern Coahuila Filter-Barrier (SCFB) effectively subdivides the mammalian fauna of the Mesa del Norte, the northern and most extensive section of the Mexican Altiplano. Pocket gophers of the genus Cratogeomys north and south of this filter-barrier have been informally recognized as 2 distinct species, C. castanops and C. goldmani, respectively. Support for species recognition derives from early morphological comparisons and recent chromosomal and ectoparasite studies. Contradictory conclusions based on the only comprehensive mor- phometric study have prevented formal recognition of C. goldmani. A morphometric reevaluation based on ratio- transformed data reveals that the previous analysis was unduly biased by size, an ecophenotypically plastic character. When this factor is removed, morphometric variation is fully concordant with chromosomal diploid number and sequence data of mitochondrial and nuclear DNA. We provide synonymies and descriptions for C.goldmani apart from C.castanops,andrevisethenumberofsubspecies from atotalof 26to2subspecies ineach species. The SCFB is most effective in its central portion (Desierto Mayran), and least effective in its western portion (Rio Nazas), which should be geographically broadened to include the neighboring Rio Aguanaval.

Evolutionary Relationships of Pocket Gophers (Cratogeomys castanopsSpecies Group) of the Mexican Altiplano