数種ネズミ類における脊椎骨数の個体変異および種間の差

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The author enumerated the numbers of vertebrae of 289 specimens of rats of Murinae and Microtinae. In each species, the numbers of cervical, thoracic, lumbar and sacral vertevrae are 7, 13, 6 and 4 respectively, and there are found no differences among the species. But, in the numbers of caudal vertevrae, there are individual variations and significant differences among the species. Mean values of caudal vertebrae of each species are as follows: in Murinae, Mus musculus var. albinus, 28; Rattus norvegicus, 30; R. norvegicus var. albinus, 28; R. rattus, 33; Apodemus speciosus, 30; A. argenteus, 32; in Microtinae, Clethrionomys andersoni, 20; Anteliomys smithii, 17; Microtus montebelli, 18. Numbers of caudal vertebrae provided a complete separation of Murinae and Microtinae groups, and gave statistically significant separations of related species such as Rattus norvegicus and R. rattus, Apodemus speciosus and A. argenteus, Clethrionomys andersoni and Anteliomys smithii.
社団法人日本動物学会の論文
1960-05-15