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FIRST PLEISTOCENE JUMPING MOUSE (ZAPUS, ZAPODINAE, RODENTIA) FROM UTAH
Dennis R. Ruez, Jr. and Christopher J. Bell
Western North American Naturalist
Vol. 64, No. 4 (October 2004), pp. 439-444
Stable URL: http://www.jstor.org/stable/41717399
Page Count: 6
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Two of the Little Dell Dam fossil localities produced the 1st Pleistocene records of the jumping mouse Zapus from Utah. We describe these teeth in detail and compare their morphology with both extinct and extant jumping mouse taxa. Although it is not possible to confidently assign these specimens to a particular species, the Little Dell Dam fossils are clearly distinct from the only living jumping mouse (Zapus princeps) currently known from Utah. The paracone is attached to the rest of the occlusal surface of the upper 1st and 2nd molars in modern Z. princeps from Utah; the paracone is isolated in the molars from Little Dell Dam. The fossils from Little Dell Dam are the 1st reported records of Pleistocene Zapus west of the Rocky Mountains.
Western North American Naturalist © 2004 Monte L. Bean Life Science Museum, Brigham Young University