Abstract
This paper studies the craniological variability of closely related species—the pine marten Martes martes, the American marten M. americana, and the sable M. zibellina. The study included the data on 22 nonmetric characters of skulls in 2344 individuals. The studied Martes species were revealed to have an evident species-specific manifestation of the investigated craniological characters. Sables stand apart most of all in the interspecific comparison of populations. The degree of epigenetic variability is somewhat higher in the sable than in the pine marten. The American marten significantly differs from Eurasian species in the manifestation of the nonmetric skull characters, which is noted when analyzing even a small number of samples.
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