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Ulaancricetodon badamae n. gen., n. sp. (Mammalia, Rodentia, Cricetidae) from the Valley of Lakes in Central Mongolia

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Kurzfassung

Aus der Hsanda Gol-Formation in der Mongolei wurdeUlaancricetodon badamae n. gen., n. sp., der bisher kleinste und urtümlichste Cricetide des Oligozäns beschrieben. Die Fossilien wurden in 13 Profilen immer in gleicher lithologischer Position unter und über der Basaltlage I vorgefunden. Aus dem radiometrischen Alter des Basaltes von 31.5 Millionen Jahren (40Ar/39Ar-Datum) ergibt sich die Einstufung der Fossilien in das Unter-Oligozän. Trotz der für Hamster charakteristischen muroiden Zahnformel (1-0-0-3/1-0-0-3) verweisen gemeinsame morphologische Merkmale auf eine nahe Verwandtschft vonUlaancricetodon badamae n. gen., n. sp. mitHeosminthus Wang 1985, einer Zapodiden-Gattung des asiatischen Ober-Eozäns und Unter-Oligozäns.

Abstract

The smallest and most primitive Oligocene cricetid,Ulaancricetodon badamae n. gen., n. sp. is described from the Hsanda Gol Formation in Mongolia. The fossils were recovered from stratified fossil horizons immediately below and above a basalt layer dated at 31.5 Ma (40Ar/39Ar-data), that is an Early Oligocene age. Although the dental formula is muroid (1-0-0-3/1-0-0-3), the tooth morphology and tooth size ofUlaancricetodon badamae n. gen., n. sp. point to a close relationship with the zapodidHeosminthus Wang 1985, which is known from the Asian Late Eocene to Early Oligocene.

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  1. Geologisch-Paläontologische Abteilung, Naturhistorisches Museum, Burgring 7, A-1014, Wien, Austria

    Gudrun Daxner-Höck

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Correspondence to Gudrun Daxner-Höck.

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Daxner-Höck, G. Ulaancricetodon badamae n. gen., n. sp. (Mammalia, Rodentia, Cricetidae) from the Valley of Lakes in Central Mongolia. Paläont. Z. 74, 215–225 (2000). https://doi.org/10.1007/BF02987963

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