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First Castorid (Mammalia, Rodentia) from the Middle Miocene of Southeast Asia

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Abstract

Today and in the Tertiary, the geographical distribution of castorids is limited throughout all of the northern continents. Fossils of the Castoridae genus Steneofiber are abundant in many localities of Eurasia from the late Oligocene to Pliocene period. Recently, Steneofiber fossils were discovered in two localities of northern Thailand, Mae Moh and Chiang Muan coal mines, in layers of late middle Miocene age. These discoveries represent the first records of castorids from Southeast Asia and correspond to their southernmost known range. The focus of this study is to describe this new Thai species of Steneofiber and to define its wear stages from the molar occlusal surfaces by using micro-CT scan analysis. The CT scan technique permits the analysis of the virtual occlusal surface changes from wear, allowing easier comparison to related species of Steneofiber cheek teeth without destroying the teeth. The new species, Steneofiber siamensis n. sp., can be distinguished from the other species of Steneofiber by several distinct characters, longer mesostriid on p4, presence of premesostria and metastria on P4, which are smaller than most of the other known species. The occurrence of this new castorid also supports a subtropical to tropical paleoclimate for these two localities of northern Thailand.

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Acknowledgments

We would like to thank Edouard-Georges Emonet and Thibaut Bienvenu for their help on the micro-CT scan analysis, and to Pauline Coster for the information relative to magnetostratigraphic results in these two localities. We are obligated to Christine Argot and Pascal Tassy for giving us facilities and help to visit and compare the materials of Steneofiber from Saint-Gérand-Le-Puy at the Muséum National d’Histoire Naturelle collections of Paris, and Mana Rugbumrung from Department of Mineral Resources, Bangkok for his assistance in the field. Financial support came from the Department of Mineral Resources, Bangkok, the University of Poitiers, the CNRS “Eclipse2” program and the ANR-05-BLAN-0235 and ANR-09-BLAN-0238-02-EVAH programs. We thank also Electricity Generating Authority Thailand for giving us access to Mae Moh mine and in providing logistic and technical assistance. Finally, we are grateful to Linda Ducrocq for improving the English version, and associate editor and all reviewers who greatly commented on this manuscript.

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Correspondence to Kantapon Suraprasit.

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Communicated by: Robert Asher

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Table 1

Dental measurements, length (L), width (W), crown height (H), and crown height index ratio (H/L), of Steneofiber siamensis n. sp. teeth (in millimeters; XLS 24 kb)

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Suraprasit, K., Chaimanee, Y., Martin, T. et al. First Castorid (Mammalia, Rodentia) from the Middle Miocene of Southeast Asia. Naturwissenschaften 98, 315–328 (2011). https://doi.org/10.1007/s00114-011-0769-0

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  • DOI: https://doi.org/10.1007/s00114-011-0769-0

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