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Paläontologische Zeitschrift

, Volume 74, Issue 4, pp 591–600 | Cite as

Gobiatherium (Mammalia: Dinocerata) from the Middle Eocene of Asia: Taxonomy and biochronological significance

  • Spencer G. Lucas
Article

Abstract

Gobiatherium Osborn & Granger 1932 is a highly distinctive genus of dinoceratan known from Eocene strata in Kyrgyzstan, Kazakstan, and Nei Mongol and Henan, People’s Republic of China. Autapomorphies ofGobiatherium among uintatheriids are: skull long, narrow and shallow with a flat sagittal region; nasals strongly arched with bony septum connecting their anterior ends to the premaxillae; zygomatic arches broad and flare outward in region of glenoid fossae; lower jaw long and shallow with tall ascending ramus and without an inframandibular flange; no upper canines; lower canines greatly reduced; P2 has prominent cingular cusp on its anterolabial corner; metacarpals relatively long and slender. Two species ofGobiatherium are valid, the type speciesG. mirificum Osborn & Granger 1932 (=G.? major Qi 1987) and the much smaller and poorly knownG. minutum Cheng & Ma 1990. G.?monolobotum Qi 1987 is a junior subjective synonym of the coryphodontid pantodontEudinoceras mongoliensis Osborn 1924. The distribution ofGobiatherium supports recognition of an Arshantan land-mammal ‘age’ (LMA) older than the Irdinmanhan LMA. The Arshantan LMA is redefined as the time interval between the first appearance datum (FAD) of the coryphodontid pantodontEudinoceras and the FAD of the brontotheriid perissodactylProtitan. Gobiatherium is one of several index taxa that allow mammalian assemblages of Arshantan age to be identified in China, Mongolia, Kazakstan and Kyrgyzstan.

Keywords

Eocene Middle Eocene Cheek Tooth Mammalian Fauna Occlusal View 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Abbreviations

AMNH

American Museum of Natural History, New York

GV

China University of Geosciences, Beijing

IPGAN

Institute of Paleobiology, Georgian Academy of Sciences, Tbilisi

IVPP

Institute of Vertebrate Paleontology and Paleoanthropology, Beijing

PIN

Paleontological Institute, Moscow

Kurzfassung

Gobiatherium Osborn & Granger 1932 ist eine sehr eigenständige Dinoceratengattung, die aus eozänen Schichten in Kirgisien, Kasachstan und der Volksrepublik China (Provinzen Innere Mongolei und Henan) bekannt ist. Autapomorphien der Gattung innerhalb der Uintatheriiden sind: langer, schmaler und flacher Schädel mit ebener Sagittalregion; stark gebogene Nasalia mit einem knöchernen Septum, das ihre Vorderenden mit den Prämaxiilaria verbindet; breite Jochbögen, die sich in der Region der Fossa glenoidalis nach außen verbreitern; langer, flacher Unterkiefer mit hohem aufsteigenden Ast, aber ohne Inframandibularflansch; keine oberen Caninen; untere Caninen stark reduziert; der P2 hat an der anterolabialen Ecke ein prominentes Höckerchen auf dem Cingulum; die Metacarpalia sind relativ lang und schlank. Es gibt zwei gültige Arten vonGobiatherium, die TypusartG. mirificum Osborn & Granger 1932 (= G.?major Qi 1987) und das wesentlich kleinere und schlecht bekannteG. minutum Cheng & Ma 1990. Die ArtG.? monolobotum Qi 1987 ist ein jüngeres subjektives Synonym des coryphodontiden PantodontenEudinoceras mongoliensis Osborn 1924. Die Verbreitung vonGobiatherium stützt das Konzept eines ArshantanLandsäugetieralters (LSA), das vor dem Irdinmanhan-LSA liegt. Das Arshantan-LSA wird neu definiert als das Zeitintervall, das zwischen dem ersten Auftreten des coryphodontiden PantodontenEudinoceras und dem ersten Auftreten des brontotheriiden PerissodactylenProtitan liegt.Gobiatherium ist eines von mehreren Leitfossilien, das die Identifikation von arshantischen Säugetier-Vergesellschaftungen in China, der Mongolei, Kasachstan und Kirgisien ermöglicht.

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Copyright information

© E. Schweizerbart’sche Verlagsbuchhandlung 2001

Authors and Affiliations

  • Spencer G. Lucas
    • 1
  1. 1.New Mexico Museum of Natural HistoryAlbuquerque, New MexicoUSA

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