Wolverine from the Pleistocene of the Yukon: evolutionary trends and taxonomy of Gulo (Carnivora: Mustelidae)

• Published in: Canadian Journal of Earth Sciences
• Main Author: Bryant, Harold N.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Canadian Science Publishing 1987
• Subjects: Yukon; Gulo gulo; Old Crow
• Online Access: http://dx.doi.org/10.1139/e87-063; http://www.nrcresearchpress.com/doi/pdf/10.1139/e87-063

Dental and mandibular measurements on a sample of Gulo gulo of possible Sangamonian to Wisconsinan age from the Old Crow Basin in the Yukon average 2.7% smaller than comparable measurements of the extant form. The difference in the width of P 4 is statistically significant. These results do not differ significantly from Harington's previous analysis of a similar sample from Old Crow, and comparable data from the two studies were pooled. Dimensions in the pooled fossil sample average 4.3% smaller; differences in the length and width of both P 4 and M 1 , and the length of the P 4 –M 1 , tooth row are significant. Bivariate analysis indicates that P 2 and P 4 are significantly narrower in the fossil sample. Old Crow wolverines conform to the general trend of increasing size and broadening of certain teeth, especially P 4 , from the mid-Pleistocene appearance of Gulo in Europe and North America to the end of the Wisconsinan. Referral of the small mid-Pleistocene Gulo to a distinct chronospecies, G. schlosseri, is questioned based on fluctuations in the size of the teeth and the variation associated with other trends in dental morphology in wolverine populations during the Quaternary in Europe and North America.