Bovidae, Gray, 1821

Suraprasit, Kantapon, Chaimanee, Yaowalak, Chavasseau, Olivier & Jaeger, Jean-Jacques, 2015, Middle Miocene bovids from Mae Moh Basin, Northern Thailand: The first record of the genus Eotragus from Southeast Asia, Acta Palaeontologica Polonica 60 (1), pp. 67-78 : 73

Bovidae gen. et sp. indet.

Fig. 3I .

Material: UPP MM-76, left m3, Mae Moh Basin, Northern Thailand; late middle Miocene (13.4–13.2 Ma), Nakhaem Formation, coal layer K.

Description and remarks.—UPP MM-76 ( Fig. 3G ) is heavily worn, making impossible to assign it to any particular genus. However, the specimen shares several morphological features, such as a selenodont tooth morphology and hypsodont crown, with Eotragus . While resembling E. lampangensis sp. nov. in the presence of a well-developed ectostylid and posterior ectostylid, UPP MM-76 differs from the other material described here in the extreme width of its anterior portion (transverse diameter of the anterior lobe measured at the base of the tooth crown) and in its poorly developed hypoconulid ( Fig. 3G ). Taken together, these features may indicate the existence of another bovid taxon in the Mae Moh Basin.

Figures

Fig. 3. Dental remains of the bovid mammals, Eotragus lampangensis sp. nov. (A–F, H, I) and Bovidae gen. et sp. indet. (G) from the the middle Miocene of Mae Moh Basin, Thailand. A. UPP MM-57, left DP3 in occlusal view. B. UPP MM-71, left M3 in occlusal (B 1) and labial (B 2) views. C. UPP MM-72, right p2 in occlusal (C 1) and lingual (C 2) views. D. UPP MM-66, right m1 in occlusal (D 1) and labial (D 2) views. E. UPP MM-62, fragmentary left mandible with p4 and m1 in occlusal (E 1) and lingual (E 2) views. F. UPP MM-73, left m2 in lingual (F 1), occlusal (F 2), and labial (F 3) views. G. UPP MM-76, left m3 in occlusal view. H. UPP MM-67, right m3 in occlusal view. I. UPP MM-74, right m3 in occlusal view.