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2014 | 59 | 4 |
Tytuł artykułu

The diversity of cimolestan mammals within the White River Group of South Dakota and Nebraska

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Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
The synonymization of the cimolestan taxa Cymaprimadon and Chadronia from the Late Eocene Chadron Formation is consistently upheld, despite a lack of supporting evidence. Here we show that the synonymization is unjustified, owing to distinct differences between these taxa in the mandibular tooth count (1-1-3-3 vs. ?-1-4-3), the identity of the enlarged anterior mandibular tooth (incisor versus canine), and the morphology of the crown of m3 (e.g., paraconid on m3 in Cymaprimadon). We also refer a specimen recently collected from the Early Oligocene Brule Formation within the Badlands National Park (BADL 16917) to Chadronia sp., thus making it the youngest occurrence of a pantolestan from North America. Examination of an additional specimen (FMNH UC 349) revealed the presence of a further cimolestan taxon in the White River Group of South Dakota, although the poor quality of the locality and stratigraphic data associated with this specimen precludes erecting a formal name. In total, this study doubles the number of cimolestans from the Late Chadronian and Orellan (Ch4 to Or1) of North America from two to four, and extends the biostratigraphic range of Pantolesta into the North American Oligocene.
Słowa kluczowe
Wydawca
-
Rocznik
Tom
59
Numer
4
Opis fizyczny
p.771-778,fig.,ref.
Twórcy
autor
  • Department of Geology and Geological Engineering, South Dakota School of Mines and Technology, 501 East St. Joseph Street, Rapid City, South Dakota 57701, USA
autor
  • Department of Geology and Geological Engineering, University of North Dakota, 81 Cornell Street, Grand Forks, North Dakota 58202, USA
  • Badlands National Park, 25216 Ben Reifel Road, Interior, South Dakota 57750, USA
  • Department of Geology and Geological Engineering, University of North Dakota, 81 Cornell Street, Grand Forks, North Dakota 58202, USA
Bibliografia
  • Clark, J. 1968. Cymaprimadontidae, a new family of insectivores. Fieldiana (Geology) 16: 241–254.
  • Cook, H.J. 1954. A remarkable new mammal from the lower Chadron of Nebraska. American Midland Naturalist 52: 388–391.
  • Cope, E.D. 1872. Second account of new Vertebrata from the Bridger Eocene. Paleontological Bulletin, American Philosophical Society 2: 466–468.
  • Cope, E.D. 1884. The Creodonta. The American Naturalist 17: 255–267, 344–353, 478–485.
  • Dashzeveg, D. and Russell, D.E. 1992. Extension of dyspternine Pantolestidae (Mammalia, Cimolesta) in the Early Oligocene of Mongolia. Geobios 25: 647–650.
  • Evanoff, E., Terry, D.O., Jr., Benton, R.C., and Minkler, H. 2010. Field guide to geology of the White River Group in the North Unit of Badlands National Park: A guide for the field trip: recent advances in understanding the geologic history of the White River Badlands, 24–25. April 2010. In: M.P. Terry, E.F. Duke, and J.A. Tielke (eds.), Geologic Field Trips in the Black Hills Region, South Dakota. South Dakota School of Mines and Technology Bulletin 21: 96–127.
  • Gunnell, G.F., and Bloch, J.I. 2008. Insectivorous mammals summary. In: C.M. Janis, G.F. Gunnell, and M.D. Uhen (eds.), Evolution of Tertiary Mammals of North America, Volume 2: Small Mammals, Xenarthrans and Marine Mammals, 49–62. Cambridge University Press, Cambridge.
  • Gunnell, G.F., Bown, T.M., Bloch, J.I., and Boyer, D.M. 2008. “Proteutheria.” In: C.M. Janis, G.F. Gunnell, and M.D. Uhen (eds.), Evolution of Tertiary Mammals of North America, Volume 2: Small Mammals, Xenarthrans and Marine Mammals, 63–81. Cambridge University Press, Cambridge.
  • Jepsen, G.L. 1934. A revision of the American Apatemyidae and the description of a new genus, Sinclairella, from the White River Oligocene of South Dakota. Proceedings of the American Philosophical Society 74: 287–305.
  • Linnaeus, C. 1758. Systema naturae per regna tria naturae, secundum classes, ordines, genera, species cum characteribus, differentiis, synonymis, locis. Tomus 1, editio decima, reformata. iii + 824 pp. Laurentii Salvii, Holmiae.
  • McKenna, M.C. 1975. Toward a phylogenetic classification of the Mammalia. In: W.P. Luckett and F.S. Szalay (eds.), Phylogeny of the Primates, 21–46. Plenum, New York.
  • McKenna, M.C. 1980. Eocene paleolatitude, climate, and mammals of Ellesmere island. Palaeogeography, Palaeoclimatology, Palaeoecology 30: 349–362.
  • McKenna, M.C. and Bell, S.K. 1997. Classification of Mammals Above the Species Level. 631 pp. Columbia University Press, New York.
  • Prothero, D.R. and Emry, R.J. 2004. The Chadronian, Orellan, and Whitneyan North American Land Mammal Ages. In: M.O. Woodburne (ed.), Late Cretaceous and Cenozoic Mammals of North America, 156–168. Columbia University Press, New York.
  • Rose, K.D. 2006. The Beginning of the Age of Mammals. 428 pp. Johns Hopkins University Press, Baltimore.
  • Terry, D.O., Jr. 1998. Lithostratigraphic revision and correlation of the lower part of the White River Group: South Dakota to Nebraska. Geological Society of America Special Paper 325: 15–37.
  • Wood, A.E. 1969. Rodents and lagomorphs from the “Chadronia pocket”, Early Oligocene of Nebraska. American Museum Novitates 2366: 1–18.
  • Woodburne, M.O. 2004. Late Cretaceous and Cenozoic Mammals of North America: Biostratigraphy and Geochronology. 376 pp. Columbia University Press, New York.
Typ dokumentu
Bibliografia
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