A cursorial description is given of the cranial morphology of Stegodon orientalis Owen, 1870, based on
materials collected by W. Granger during 1920-1921 from Yanjingou, Sichuan, China. The cranial vault
of S. orientalis shows enigmatic autapomorphies such as loss of the crista nuchae, a pair of prominent
domes on the vertex and a shallow groove on the forehead. Beside these enigmatic characteristics, the
cranial morphology, the forehead in particular, closely resembles that of S. trigonocephalus and S.
ganesa, suggesting a sister-group relationship for S. orientalis and the S. trigonocephalus group
(sensu Saegusa, in print)
抄録全体を表示