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Article
Evolutionary Relationships of Pocket Gophers (Cratogeomys castanops Species Group) of the Mexican Altiplano
Journal of Mammalogy (2008)
  • David J. Hafner
  • Mark S. Hafner
  • Gerald L. Hasty, Louisiana State University
  • Theresa A. Spradling, University of Northern Iowa
  • James W. Demastes, University of Northern Iowa
Abstract
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 morphometric 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, and revise the number of subspecies from a total of 26 to 2 subspecies in each species. The SCFB is most effective in its central portion (Desierto Mayrán), and least effective in its western portion (Río Nazas), which should be geographically broadened to include the neighboring Río Aguanaval.
Keywords
  • chromosomes,
  • Cratogeomys,
  • filter-barrier,
  • mitochondrial DNA,
  • morphology,
  • nuclear DNA,
  • pocket gophers,
  • systematics
Disciplines
Publication Date
2008
DOI
http://dx.doi.org/10.1644/07-MAMM-A-001.1
Citation Information
David J. Hafner, Mark S. Hafner, Gerald L. Hasty, Theresa A. Spradling, et al.. "Evolutionary Relationships of Pocket Gophers (Cratogeomys castanops Species Group) of the Mexican Altiplano" Journal of Mammalogy Vol. 89 Iss. 1 (2008) p. 190 - 208
Available at: http://works.bepress.com/james_demastes/11/