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Identification and Distribution of Three Species of Pocket Mice (Genus Perognathus) in Trans-Pecos Texas
Kenneth T. Wilkins and David J. Schmidly
The Southwestern Naturalist
Vol. 24, No. 1 (Mar. 30, 1979), pp. 17-31
Published by: Southwestern Association of Naturalists
Stable URL: http://www.jstor.org/stable/3670621
Page Count: 15
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Confusion frequently exists with regard to the identification of three species of pocket mice (Perognathus penicillatus, P. intermedius, and P. nelsoni) of the subgenus Chaetodipus. To determine accurate ways of distinguishing these species, we recorded 12 cranial and 4 external measurements from large series of specimens of each species in Trans-Pecos Texas. Methods of identifying skin-only and skull-only specimens are presented. Skins are most easily distinguished on the basis of degree of presence or absence of rump spines. Because qualitative cranial features reported in the literature were not consistently reliable in distinguishing species, discriminant function analysis was used to identify skulls of these species. Correct identification of specimens has resulted in the first record of sympatry between P. intermedius and P. nelsoni as well as a redefinition of the ranges of these three species in Trans-Pecos Texas.
The Southwestern Naturalist © 1979 Southwestern Association of Naturalists