Early Pleistocene Javan rhinoceros from the Irrawaddy Formation, Myanmar
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- Zin-Maung-Maung-Thein
- Primate Research Institute, Kyoto University, Inuyama, Aichi 484-8506, Japan
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- ツバモト, タケヒサ
- Center for Paleobiological Research, Hayashibara Biochemical Laboratories, Inc., Shimoishii, Okayama 700-0907, Japan
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- Maung-Maung
- Department of Geology, Loikaw University, Loikaw, Myanmar
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抄録
We report dental fossils of Javan rhinoceros, Rhinoceros sondaicus (Mammalia, Perissodactyla, Rhinocerotidae), discovered from the upper part of the Irrawaddy Formation, the lower Pleistocene of central Myanmar. This is the first discovery of R. sondaicus from the Irrawaddy Formation, and these materials are possibly to be the oldest fossil record of this species in the world. The present materials consist of two fragmentary maxillae with M_1-3. They are referable to those of Rhinoceros sondaicus in having the following characteristics on the upper molars: moderately developed molar crochet, subhypsodonty, absence of the molar crista and antecrochet, absence of the protocone fold, absence of the metacone bulge on M_3, sinuosity of the ectoloph, strong molar parastyle fold, and deeper median valley than the posterior valley. The discovery of early Pleistocene Rhinoceros sondaicus in Myanmar fills geographical and chronological gaps between the late Miocene Gaindartherium (a probable ancestor of the genus Rhinoceros) from Indo-Pakistan and middle Pleistocene R. sondaicus from Java and Sumatra. It suggests that this species originated as early as early Pleistocene in continental Asia.
収録刊行物
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- Asian paleoprimatology
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Asian paleoprimatology 4 197-204, 2006
Primate Research Institute, Kyoto University
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詳細情報 詳細情報について
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- CRID
- 1050845760743743872
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- NII論文ID
- 120005649372
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- NII書誌ID
- AA12649564
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- ISSN
- 18807747
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- HANDLE
- 2433/199762
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- 本文言語コード
- en
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- 資料種別
- departmental bulletin paper
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- データソース種別
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- IRDB
- CiNii Articles