Hostname: page-component-848d4c4894-wg55d Total loading time: 0 Render date: 2024-06-02T14:35:27.076Z Has data issue: false hasContentIssue false
  • English
  • Français

Evolution in Yoderimyinae (Eomyidae: Rodentia), with new material from the White River Formation (Chadronian) at Flagstaff Rim, Wyoming

Published online by Cambridge University Press:  20 May 2016

Robert J. Emry  and
William W. Korth
Robert J. Emry
Affiliation:
1Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, D.C. 20560
William W. Korth
Affiliation:
2Department of Geological Sciences, University of Rochester, Rochester, New York 14625, and Department of Geosciences, Hobart and William Smith Colleges, Geneva, New York 14456
Get access Rights & Permissions [Opens in a new window]

Abstract

Three species of Yoderimyinae (Eomyidae: Rodentia) are recognized from the lower part of the White River Formation (early to medial Chadronian) in the Flagstaff Rim area, Wyoming. The new material allows an improved diagnosis for the subfamily. The enamel microstructure of Yoderimyinae supports its inclusion in the Eomyidae.

A new genus, Zemiodontomys, is established for Yoderimys burkei Black, and new material, including upper dentition, is referred to this species. This genus differs from Yoderimys in having higher crowned and more lophodont teeth and in lacking P3. A second new genus, Litoyoderimys, is established for Yoderimys lustrorum Wood, and a new species, L. auogoleus, is referred to the genus. This genus has lower crowned, more cuspate teeth than Yoderimys.

Through early and medial Chadronian time, evolution in yoderimyines includes the following morphologic transformations: increase in size; increase in crown height and lophodonty of cheek teeth; reduction of P3 (from double-rooted, to single-rooted, to absent); increase in relative size of P4 and p4; and increased longitudinal torsion of the mandible.

Type
Research Article
Information
Journal of Paleontology , Volume 67 , Issue 6 , November 1993 , pp. 1047 - 1057
Copyright
Copyright © The Paleontological Society 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Black, C. C. 1965. Fossil mammals from Montana, Pt. 2, Rodents from the early Oligocene Pipestone Springs Local Fauna. Annals of Carnegie Museum, 38:1–48.CrossRefGoogle Scholar
Bowdich, T. E. 1821. An Analysis of the Natural Classifications of Mammalia for the Use of Students and Travellers. J. Smith, Paris, 115 p.Google Scholar
Deperet, C., and Douxami, A. 1902. Les vertébrés oligocènes de Pyrimont-Chalonges (Savoie). Abhandlungen der Schweizerischen Palaeontologischen Gesellschaft, 29:1–91.Google Scholar
Emry, R. J. 1973. Stratigraphy and preliminary biostratigraphy of the Flagstaff Rim Area, Natrona County, Wyoming. Smithsonian Contributions to Paleobiology, 18:1–43.Google Scholar
Emry, R. J. 1978. A new hypertragulid (Mammalia, Ruminantia) from the early Chadronian of Wyoming and Texas. Journal of Paleontology, 52:1,004–1,014.Google Scholar
Emry, R. J., Bjork, P. R., and Russell, L. S. 1987. The Chadronian, Orellan, and Whitneyan North American Land Mammal Ages, p. 118–152. In Woodburne, M. O. (ed.), Cenozoic Mammals of North America: Geochronology and Biostratigraphy. University of California Press, Berkeley.Google Scholar
Fahlbusch, V. 1979. Eomyidae—Geschichte einer Säugetierfamilie. Palaeontologische Zeitschrift, 53:88–97.CrossRefGoogle Scholar
Kihm, A. J. 1987. Mammalian paleontology and geology of the Yoder Member, Chadron Formation, east-central Wyoming, p. 28–45. In Martin, J. E. and Ostrander, G. E. (eds.), Papers in Vertebrate Paleontology in Honor of Morton Green. Dakoterra, 3.Google Scholar
Ostrander, G. E. 1985. Correlation of the early Oligocene (Chadronian) in northwestern Nebraska, p. 205–231. In Martin, J. E. (ed.), Fossiliferous Cenozoic Deposits of Southwestern South Dakota and Northwestern Nebraska. Dakoterra, 2.Google Scholar
Russell, L. S. 1972. Tertiary mammals of Saskatchewan. Part III: The Oligocene fauna, non-ungulate orders. Life Sciences Contributions of the Royal Ontario Museum, 84:1–97.Google Scholar
Storer, J. E. 1978. Rodents of the Calf Creek local fauna (Cypress Hills Formation, Oligocene, Chadronian) Saskatchewan. Natural History Contributions of the Saskatchewan Museum of Natural History, 9:1–61.Google Scholar
Storer, J. E. 1987. Dental evolution and radiation of Eocene and early Oligocene Eomyidae (Mammalia, Rodentia) of North America, with new material from the Duchesnean of Saskatchewan, p. 108–117. In Martin, J. E. and Ostrander, G. E. (eds.), Papers in Vertebrate Paleontology in Honor of Morton Green. Dakoterra, 3.Google Scholar
Wahlert, J. H. 1978. Cranial foramina and relationships of the Eomyoidea (Rodentia, Geomorpha). Skull and upper teeth of Kansasimys. American Museum Novitates, 2645:1–16.Google Scholar
Wahlert, J. H., and von Koenigswald, W. 1985. Specialized enamel in incisors of eomyid rodents. American Museum Novitates, 2832:1–12.Google Scholar
Wilson, J. A., and Runkel, A. C. 1991. Prolapsus, a large sciuravid rodent, and new eomyids from the late Eocene of Trans-Pecos Texas. Pearce-Sellards Series, 48:1–30.Google Scholar
Wood, A. E. 1955. Rodents from the lower Oligocene Yoder Formation of Wyoming. Journal of Paleontology, 29:519–524.Google Scholar
Wood, A. E. 1974. Early Tertiary vertebrate fauna, Vieja Group, Trans-Pecos Texas: Rodentia. Bulletin of the Texas Memorial Museum, 21:1–112.Google Scholar
Wood, A. E. 1980. The Oligocene rodents of North America. Transactions of the American Philosophical Society, 70:1–68.CrossRefGoogle Scholar
Wood, A. E., and Wilson, R. W. 1936. A suggested nomenclature for the cusps of the cheek teeth of rodents. Journal of Paleontology, 10:388–391.Google Scholar