Fossil Record 21(2): 291-299, doi: 10.5194/fr-21-291-2018
First occurrence of Duboisia (Bovidae, Artiodactyla, Mammalia) from Thailand
expand article infoYuichiro Nishioka, Chavalit Vidthayanon§
‡ Waseda Institute for Advanced Study, Waseda University, Shinjuku, 169-8050, Japan§ independent researcher: Bangkok, 10900, Thailand
Open Access

The first fossil record of Duboisia (Boselaphini, Bovidae) fromThailand confirms that this genus is no longer endemic to Java, Indonesia.The new fossil material is a calvarium with horn cores (older than the MiddlePleistocene) collected from a sandpit at Tha Chang, Nakhon RatchasimaProvince, north-eastern Thailand. The present specimen is provisionallyallocated to a species of Duboisia aff. D. santeng, whichhas weaker precornual ridges and anterior keels on the horn cores thanD. santeng from Early and Middle Pleistocene deposits of Java, butthese species share basic characteristics of horn cores as follows: the lowerhalf inclined backwards; the upper half curved upwards; cross section roundedtriangular, antero-posteriorly compressed, and with medial and lateral keels.Morphological similarities between D. aff. santeng and D. santeng support a strong faunal interchange between continental South East Asiaand Java before the Middle Pleistocene, and suggest that the genusDuboisia diverged from the other genera of Boselaphini in the“Siva-Malayan” region.