Asian gliriform origin for arctostylopid mammals (original) (raw)

Abstract

Arctostylopids are common in Late Palaeocene and Early Eocene mammal faunas of Asia, but they are rare in North America. From the time of their first discovery, arctostylopids were grouped with the strictly endemic South American Notoungulata based on their strikingly similar dental morphology. This relationship was challenged based on dental morphology of more recently discovered arctostylopids and on supposed tarsal morphology (based on unassociated material) of the Asian arctostylopid Palaeostylops. Therefore, Arctostylopidae were placed in a separate order, Arctostylopida, of enigmatic affinities. Many authors, however, continue to unite Arctostylopidae and Notoungulata based on dental similarities. In the Late Palaeocene Subeng site in Inner Mongolia, we identified the Palaeostylops tarsals based on their size and abundance. This identification is supported by comparison to unpublished Arctostylops tarsals from the North American Clarkforkian, derived from a semi-articulated skeleton also including dental material. Tarsal morphology shows moderate similarity to the gliriform Pseudictops, and strong resemblance to the tarsally conservative gliroid Rhombomylus. Hence, Arctostylopidae may best be grouped with Asian non-gliroid Gliriformes, which we interpret as having dispersed into North America in the Late Palaeocene.

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Acknowledgements

The authors thank Christian de Muizon (MNHN, France), Peter Kondrashov (NMSU, USA) and Lilian Bergqvist (UFRJ, Brazil) for the discussions and access to reference materials. At the RBINS, Julien Cillis produced the SEM micrographs, and Stephane Berton prepared the drawings. This work was financially supported by projects MO/36/011 and BL/36/C12 of the Belgian Federal Science Policy Office (TS) and by the RF-Flanders (PM).

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Authors and Affiliations

  1. Research Unit Paleontology, Ghent University, Krijgslaan 281-S8, 9000, Ghent, Belgium
    Pieter Missiaen
  2. Department of Paleontology, Royal Belgian Institute of Natural Sciences (RBINS), rue Vautier 29, 1000, Brussels, Belgium
    Thierry Smith
  3. Department of Natural Sciences, Inner Mongolian Museum (IMM), Xinhua Street 2, Hohhot, Inner Mongolia, 010020, China
    Dian-Yong Guo
  4. Florida Museum of Natural History, University of Florida, Dickinson Hall 22, Gainesville, FL, 32611-7800, USA
    Jonathan I. Bloch
  5. Department of Geological Sciences and Museum of Paleontology, University of Michigan, Geddes Road 1109, Ann Arbor, MI, 48109-1079, USA
    Philip D. Gingerich

Authors

  1. Pieter Missiaen
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  2. Thierry Smith
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  3. Dian-Yong Guo
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  4. Jonathan I. Bloch
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  5. Philip D. Gingerich
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Correspondence toPieter Missiaen.

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Pieter Missiaen is an aspirant of the Research Foundation-Flanders (RF-Flanders)

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Missiaen, P., Smith, T., Guo, DY. et al. Asian gliriform origin for arctostylopid mammals.Naturwissenschaften 93, 407–411 (2006). https://doi.org/10.1007/s00114-006-0122-1

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