| 单词 | Eutamias |
| 例句 | The above description of molting is based on study of a large series of specimens of Eutamias minimus silvaticus taken in several seasons of the year. Geographic Distribution and Taxonomy of the Chipmunks of Wyoming Eutamias sonomae Grinnell Figure 4 Upper parts rich reddish, more or less dulled by gray; backs of pinnae of ears nearly bare; tail long and bushy; size large; skull large, long, and narrow; rostrum deep. The Baculum in the Chipmunks of Western North America Three other wide-spread species are differentiated into lowland and highland subspecies; two of these species, Eutamias minimus and Peromyscus maniculatus, are represented on the Grand Mesa by the darker subspecies of the mountains. Mammals of the Grand Mesa, Colorado Three new subspecies of chipmunks of the genus Eutamias from Nevada. Taxonomy of the Chipmunks, Eutamias quadrivittatus and Eutamias umbrinus The characters given to separate ‘Eutamias’ from Tamias are based only on the absence or presence of the functionless premolar, and on the colour pattern. Genera and Subgenera of Chipmunks Known occurrence and probable geographic distribution of the subspecies of Eutamias minimus in Wyoming. Geographic Distribution and Taxonomy of the Chipmunks of Wyoming So they named this one Eutamias, which means "good" or "extra good" Chipmunk. Wild Animals at Home The subgenus Eutamias occurs on the Asiatic side and the subgenus Neotamias occurs on the North American side of Bering Strait, yet the two subgenera agree in the ten features referred to. Genera and Subgenera of Chipmunks The taxonomic status of some chipmunks of the genus Eutamias in southwestern Utah. Taxonomy of the Chipmunks, Eutamias quadrivittatus and Eutamias umbrinus The plane formed by the lamina in Eutamias makes an angle of approximately 90 degrees with the plane formed by the manubrium; in Tamias the two planes make an angle of approximately 60 degrees. Genera and Subgenera of Chipmunks Known occurrences and probable geographic distribution of the subspecies of Eutamias umbrinus in Wyoming. Geographic Distribution and Taxonomy of the Chipmunks of Wyoming In everything but colours it is Eutamias or Tamias of a more intensified type. Wild Animals at Home Character Eutamias Tamias Shape of head of malleus. not elongated. elongated. Genera and Subgenera of Chipmunks Eutamias, Ellerman, J. R., The families and genera of living rodents. Genera and Subgenera of Chipmunks The bacula of North American sciurids are divisible into six distinct types represented by those of the genera Spermophilus, Marmota, Sciurus, Tamiasciurus, Eutamias, and Glaucomys. Genera and Subgenera of Chipmunks Comparisons.—For comparisons with the other species of Eutamias in Wyoming, see the accounts of E. minimus, E. amoenus, and E. dorsalis. Geographic Distribution and Taxonomy of the Chipmunks of Wyoming The head of the malleus in Tamias is clearly more elongated than in Eutamias. Genera and Subgenera of Chipmunks Examination of series of mallei of Eutamias and Tamias indicate that there is slight individual variation, slight variation with age, and no secondary sexual variation. Genera and Subgenera of Chipmunks Specimens of the subgenus Eutamias from Manchuria have mallei which are morphologically close to the mallei of the subgenus Neotamias. Genera and Subgenera of Chipmunks Ventral views of the hyoid apparatus in Tamias and Eutamias. Genera and Subgenera of Chipmunks From this study of variation of the baculum in American chipmunks, it can be extrapolated that the baculum in the Asiatic Eutamias would show little individual variation in structure. Genera and Subgenera of Chipmunks The width of the longitudinal stripes is uniform in Eutamias whereas in Tamias the dorsal, longitudinal light stripes are more than twice as wide as the other stripes. Genera and Subgenera of Chipmunks In Eutamias townsendii, however, the infraorbital foramen is rounded as much as in the subgenus Eutamias and in the genus Tamias. Genera and Subgenera of Chipmunks Width of the postorbital process at base.—The postorbital process is broader at the base in the subgenus Eutamias and in the genus Tamias than in most species of the subgenus Neotamias. Genera and Subgenera of Chipmunks In Eutamias, only the two lateralmost dark stripes are short, whereas in Tamias all four of the lateral dark stripes are short; none extends to the rump or to the shoulder. Genera and Subgenera of Chipmunks In E. townsendii, however, this process is relatively as broad as in the subgenus Eutamias and in the genus Tamias. Genera and Subgenera of Chipmunks This difference may be correlated with differences in size, since specimens of the subgenus Eutamias and the genus Tamias are larger than specimens of the subgenus Neotamias. Genera and Subgenera of Chipmunks In specimens of E. t. townsendii of the subgenus Neotamias, however, the degree of constriction of the interorbital region is approximately the same as in the subgenus Eutamias and the genus Tamias. Genera and Subgenera of Chipmunks Shape of the pinna.—The pinna is narrower and more pointed in the subgenus Neotamias than in the subgenus Eutamias and the genus Tamias. Genera and Subgenera of Chipmunks As shown in table 1, there are ten characters by means of which Eutamias and Tamias can be separated consistently. Genera and Subgenera of Chipmunks Critical examination of new and old evidence reveals, nevertheless, that the subgenera Eutamias and Neotamias of the genus Eutamias are more closely related to one another than either is to the genus Tamias. Genera and Subgenera of Chipmunks Because the genera Eutamias and Tamias occupy similar ecological niches, the structural similarities that permit these animals to be called chipmunks, show convergence, and thus can be assumed to be adaptive. Genera and Subgenera of Chipmunks Eutamias and Tamias are distinct genera of chipmunks. Genera and Subgenera of Chipmunks Notes on the chipmunks of the genus Eutamias occurring west of the east base of the Cascade-Sierra system, with descriptions of new forms. Genera and Subgenera of Chipmunks |
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