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Theresa A. Spradling, James W. Demastes, David J. Hafner, Paige L. Milbach, Fernando A. Cervantes, Mark S. Pocket gophers of the genus Orthogeomys show unusually high morphological and ecological diversity compared to other genera in the family Geomyidae. Recent studies have called into question the monophyly of Orthogeomys , as well as the validity of 4 currently recognized Orthogeomys species. To date, the taxonomic validity of only 1 of these species has been verified Hafner et al.
In this analysis, the first to include all 11 recognized species of the genus, we examine 3 mitochondrial and 2 nuclear gene sequences 4, base pairs and analyze cranial morphology to explore relationships within the genus. Our data support a taxonomic revision that restricts the genus Orthogeomys to a single species O. In addition, 3 currently recognized species of Orthogeomys are synonymized as follows: O. A synonymy and a key to the species of the genera Orthogeomys and Heterogeomys are provided.
The pocket gopher genus Orthogeomys Rodentia: Geomyidae is notable for its morphological and ecological diversity. Size variation is impressive, with up to a 6-fold difference in mass among species, ranging from to g even within a single subgenus Macrogeomys — Hafner In 1 Oaxacan subspecies of O. Whereas nearly all pocket gopher species are unicolored dorsally and show a high degree of background soil color matching, 4 Orthogeomys species have conspicuous white patches in the form of a full or partial lumbar belt nearly fixed in O.
Species of Orthogeomys can be found in humid lowlands, arid lowlands, agricultural fields, rainforests, and montane forests, at elevations ranging from sea level to 3, m Nowak In , C. Hart Merriam published the 1st comprehensive systematic study of pocket gophers exclusive of Thomomys. Although his sample sizes were low e. Although Merriam made few direct statements about interrelationships among genera of pocket gophers, his conceptual tree depicted Orthogeomys , Heterogeomys , and Macrogeomys as stemming from a common ancestor not shared by other pocket gopher genera.