Sex Dimorphism in the Pelvis of Rodents

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Abstract
Although it has been known for some time that intraspecific structural variation in the region of the pelvis occurs in certain mammals, it was not until 1936 that single pelvis bone shape differences were described and attributed to sex dimorphism (Gardner, 1936). More recent studies on the meadow mouse Microtus have demonstrated that the pubic arm of the pelvis in female Microtus tends to be narrower than that of the male and that it tends to be longer in proportion to the ischial arm in the female than in the male (Guilday, 1951). Other studies have shown that sex differences are present in the pelvis of Apodemus, Mus, and Clethrionomys and that males may be separated from females quite accurately in these species by taking certain pelvic measurements (Becker, 1954).