Neogene Bovidae from Tha Chang Sandpits, Nakhon Ratchasima, Northeastern Thailand

Yuichiro Nishioka; Chavalit Vidthayanon; Rattanaphorn Hanta; Jaroon Duangkrayom; Pratueng Jintasakul

Authors

Yuichiro Nishioka Museum of Natural and Environmental History, Shizuoka, Shizuoka 422-8017, Japan
Chavalit Vidthayanon Independent Consultant on Biodiversity, Bangkok 10900, Thailand
Rattanaphorn Hanta Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand
Jaroon Duangkrayom Northeastern Research Institutes of Petrified Wood and Mineral Resources, Nakhon Ratchasima Rajabhat University, Nakhon Ratchasima 30000, Thailand; Geoinformatic Program, Faculty of Science and Technology, Nakhon Ratchasima Rajabhat University, Nakhon Ratchasima 30000, Thailand
Pratueng Jintasakul Northeastern Research Institutes of Petrified Wood and Mineral Resources, Nakhon Ratchasima Rajabhat University, Nakhon Ratchasima 30000, Thailand

Keywords:

Bovini, mammal, fossil, Miocene, Khorat, Southeast Asia

Abstract

The Neogene bovids (Artiodactyla, Mammalia) from Tha Chang sandpits No. 8 and No. 10, Nakhon Ratchasima, northeastern Thailand were taxonomically examined, with systematic descriptions of ancestral bovins, Selenoportax and Pachyportax species. The fossil assemblage from sandpit No. 8 is composed of one species, S. vexillarius, with many early late Miocene mammals corresponding to the Hipparion datum of South Asia. The fossil assemblage from sandpit No. 10 includes two species, S. falconeri and P. giganteus. The occurrence range of S. falconeri is slightly older than that of P. giganteus in South Asia, but they probably coexisted during the late Miocene in continental Southeast Asia. The finding of Selenoportax and Pachyportax species from Tha Chang sandpits confirms early dispersal of these species between South Asia and Southeast Asia during the late Miocene.

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