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Yellow-faced pocket gopher : ウィキペディア英語版 | Yellow-faced pocket gopher
The yellow-faced pocket gopher (''Cratogeomys castanops'') is a species of pocket gopher that is native to shortgrass prairies in the Southwestern United States and Northern Mexico. It is the species that lives north of the Southern Coahuila Filter-Barrier (SCFB).〔http://www.bioone.org/doi/abs/10.1644/07-MAMM-A-001.1〕 Among the different species, the yellow-faced pocket gopher has a small to medium sized skull.〔Russell, R. J. , 1968b. Revision of pocket gophers of the genus Pappogeomys. Univ. Kansas Publ., Mus. Nat. Hist., 16:581-776〕 The fossil of this genus was recorded from the pre-Pleistocene Benson Beds of Arizona.〔Russell, R. J., 1969. Intraspecific population structure of the species Pappogeomys castanops. Pp. 337-371, in Contributions in mammalogy (J. K. Jones, Jr., ed.). Misc. Publ. Mus. Nat. Hist., Univ. Kansas, 51:1-428〕 The yellow-faced pocket gopher has a yellowish-brown coat, a short tail, and one deep groove down the anterior middle of each incisor. ==Form and Function== Adults of ''C. castanops'' in Texas begin to molt in August and continue through March. The new pelage was found to be thicker, but had no change in color 〔Ikenberry, R. D. 1964. Reproductive studies of the Mexican pocket gopher, Cratogeomys castanops perplanus. Unpubl. M.S. thesis, Texas Tech Univ., Lubbock, v + 47pp.〕 In Kansas, semiannual molts in adults have been reported: 1. Molt from winter to summer early in the spring and 2. Molt in autumn in September and October 〔Birney, E. C., J.K. Jones, Jr., and D. M. Mortimer. 1971. The yellow-faced pocket gopher, Pappogeomys castanops, in Kansas. Trans. Kansas Acad. Sci., 73:368-375〕 There is sexual dimorphism in the yellow-faced pocket gophers; the males are larger than the females. The males of all genera of pocket gophers continue to grow after attaining sexual maturity, but females grow little after reaching sexual maturity.〔Chase, J. D., W.E. Howard, and J. T. Rosenberry. 1982. Pocket gophers, Geomyidae. Pp. 239-255, in Wild mammals of North America: biology, management, and economics (J.A. Chapman and G.A. Feldhamer, eds.). Johns Hopkins Univ. Press, Baltimore, xiii + 1147 pp.〕
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