Toggle navigation. Table of Content 15 June , Volume 15 Issue Previous Issue Next Issue. The Xiaohe area hominoid sites are situated in the northwestern portion of the Yuanmou Basin. The small-sized ape described in this paper is associated with a large hominoid, which was excavated by the joint team from the Yunnan Provincial Museum and the Yuanmou Man Exhibition Hall from to The small-sized ape remains were recovered from Loc.
All localities in the Xiaohe area are roughly contemporary in age and are younger than the Lufeng hominoid site 8 Ma on the basis of their mammalian fauna. The material includes 36 isolated teeth except C, I2 and P3. The small ape is named Dianopithecus progressus gen. The flat upper incisors are short and broad and the upper premolar is subtriangular in outline with a closely buccal and lingual cusps.
The upper molars exhibit curved mesial and distal edges. The large P4 is characterized by a relatively shallow talonid basin, the fovea anterior is reduced and there is a ridge from the anterior part of the protoconid extending to the base of the crown. The distance between the protoconid and hypoconid is relatively short and the hypoconulid is reduced in the lower molars especially in M1.
The lower molar has a small triangular fovea which is situated in the posterior part of anterior fovea, between the protoconid and metaconid.
The groove system conforms to the basic Dryopithecus Y-pattern in the M1. Dianopithecus progressus gen. As described above, the dental morphology of Dianopithecus progressus gen. The dental morphology of Dianopithecus progressus gen. The morphology of D. In the mammalian fauna. Dorcabune, Propotamochoerus, Metacervulus, Muntiacus and Hipparion are common but Selenoportax, which is present at the Lufeng hominoid site, is absent.
