Brachypotherium (Perissodactyla,Rhinocerotidae) from the late Miocene of Samburu Hills,Kenya |
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| Authors: | Naoto Handa Masato Nakatsukasa Yutaka Kunimatsu Hideo Nakaya |
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| Affiliation: | 1. Museum of Osaka University, 1-20 Machikaneyama-cho, Toyonaka, 560-0043 Osaka, Japan;2. Laboratory of Physical Anthropology, Graduate School of Science, Kyoto University, Kitashirakawa-oiwakecho, 606-8502 Sakyo-ku, Kyoto, Japan;3. Faculty of Business Administration, Ryukoku University, 67 Tsukamoto-cho, Fukakusa, 612-8577 Fushimi-ku, Kyoto, Japan;4. Graduate School of Science and Engineering, Kagoshima University, 1-21-35 Korimoto, 890-0065 Kagoshima, Japan |
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| Abstract: | Several isolated cheek teeth and mandibular specimens of Rhinocerotidae (Mammalia, Perissodactyla) from the upper Miocene Namurungule Formation in Samburu Hills, Kenya, are redescribed. Previously, these specimens had been identified as Chilotheridium pattersoni, Chilotheridium sp., Paradiceros mukirii, and Paradiceros sp. They are reidentified here as documenting the genus Brachypotherium based on their bucco-lingually broad molariform upper premolars with short crochet and flattened buccal walls on both upper and lower molars, the latter having a shallow external groove. Comparisons with other Brachypotherium species suggest that the present specimens belong to Brachypotherium sp. cf. B. minor. The presence of Brachypotherium in the Samburu Hills, at ca. 9.5 Ma, is concordant with the paleoenvironment (presence of lacustrine and river environments) known for this locality during the early late Miocene. |
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| Keywords: | Rhinocerotidae Late Miocene Samburu Hills Kenya |
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