. Biology of New World Microtus. Rodents; Rodents; Microtus; Voles. Fig. 7. Selected morphotypes of ml and M2 in Microtus. A, ml typical of M. paroperarius group; B, ml typical of non-paroperarius group of Microtus; C, M2 typical of most non-pennsylvamcus species of Microtus; D, M2 seen in some M. mexicanus and M. calijornicus showing incipient development of additional triangle; E, M2 of M. richardsont showing further development of additional triangle; F, M2 typical of M. pennsylvanicus showing additional triangle. specimens from New Paris #4 are equivalent in size to those from extant popul
. Biology of New World Microtus. Rodents; Rodents; Microtus; Voles. Fig. 7. Selected morphotypes of ml and M2 in Microtus. A, ml typical of M. paroperarius group; B, ml typical of non-paroperarius group of Microtus; C, M2 typical of most non-pennsylvamcus species of Microtus; D, M2 seen in some M. mexicanus and M. calijornicus showing incipient development of additional triangle; E, M2 of M. richardsont showing further development of additional triangle; F, M2 typical of M. pennsylvanicus showing additional triangle. specimens from New Paris #4 are equivalent in size to those from extant populations of Labrador and Quebec. Guilday et al. (1977) suggested that M. chrotorrhinus was able to survive in the east (in contrast to M. xanthognathus) by moving to higher elevations when the climate changed in post-glacial time. It was able to extend its range into northeastern Canada after the ice melted. Microtus xanthognathus (Leach, 1815).—Fossil remains of the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Tamarin, Robert H; American Society of Mammalogists. [Stillwater, Okla. ] : American Society of Mammalogists ; Shippensburg, Pa. : distributed by Vertebrate Museum, Shippensburg University
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectrodents
