. Biology of New World Microtus. Rodents; Rodents; Microtus; Voles. 106 Hoffmann and Koeppl. Fig. 16. Distributions of M. oaxacensis (1), M. umbrosus (2), and Microtus gua- temalensis (3) (modified from Hall, 1981). land bridge. However, Martin (1979) was more cautious, and sug- gested that the earliest records in North America might predate those in Eurasia. In any event, the lineages of this early radiation probably include the subgenera Phaiomys (now restricted to the Old World) and early Neodon (Martin, 1974; Repenning, 1980). Sur- vivors of this early radiation in the New World may includ
. Biology of New World Microtus. Rodents; Rodents; Microtus; Voles. 106 Hoffmann and Koeppl. Fig. 16. Distributions of M. oaxacensis (1), M. umbrosus (2), and Microtus gua- temalensis (3) (modified from Hall, 1981). land bridge. However, Martin (1979) was more cautious, and sug- gested that the earliest records in North America might predate those in Eurasia. In any event, the lineages of this early radiation probably include the subgenera Phaiomys (now restricted to the Old World) and early Neodon (Martin, 1974; Repenning, 1980). Sur- vivors of this early radiation in the New World may include M. umbrosus (Martin, 1974) and perhaps M. guatemalensis (Repen- ning, 1980), both of which exhibit relict distributions in the mon- tane cloud forests of Mexico and Guatemala (Fig. 16). Middle Pleistocene A later dispersal event, about , brought "even-more- modern-looking forms" (Repenning, 1980), including later Neodon, and the subgenus Pitymys (L. W. Martin [1979] and R. Martin [1974] placed the first appearance of Pitymys later, around 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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