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甘肃东乡早更新世黄土底部发现松鼠一新亚科——高冠协鼠亚科(Aepyosciurinae subfam.nov.).该亚科以其单面高冠的脊形齿成为世界上惟一的具高冠齿的松鼠.它的颊齿的形态结构与现在生活在非洲中西部热带和亚热带森林中的Anomalurinae的有些相似.东方高冠松鼠(新属、新种)(Aepyosciurusorientalis gen.et sp.nov.)可能生活在高山林地盛草地,以比较坚硬的树叶、树皮或草为食.这表明在更新世初期距今约200万年前青藏高原的东北缘.经过抬升,已经成为遭受切割的沟壑高山地带,气候较干燥,为东方高冠齿松鼠的繁衍生息提供了环境条件.
The subfamily Aepyosciurinae subfam.nov., A new squirrel found in the bottom of the Early Pleistocene loess in Dongxiang, Gansu, has become the only one with high crown in the world The squirrel has a morphological structure similar to that of Anomalurinae now living in the tropical and subtropical forests of central and western Africa. Aepyosciurus orientalis gen.et sp.nov. In the woodlands of high mountains, with relatively hard leaves, bark or grass for food.This shows that in the early Pleistocene about 2000000 years ago the northeastern margin of the Qinghai-Tibet Plateau.Updated, has become the cutting of gully mountain, The climate is drier, providing environmental conditions for the multiplication of the oriental high-crown squirrel.