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根据在甘肃临夏盆地中中新世早期东乡组地层中发现的1支成年鹿角、3枚颊齿、1枚距骨和1枚跟骨建立了皇冠鹿新种——广河皇冠鹿(Stephanocemas guangheensis sp.nov.)。它是皇冠鹿属中一个体型相当小的种,其鹿角显著掌状化,在成年个体中具有6个角枝。新种鹿角的组合特征区别于皇冠鹿的其他已知种,如中等大小的掌状部和向上伸展的侧枝;掌状部腹面具短的角柄,其横截面为外缘平直的半圆形;未封闭的脱落疤痕浅凹并布满海绵状孔隙。S.guangheensis比早中新世晚期的S.aralensis和S.actauensis进步,但比中中新世的S.palmatus原始。东乡组是临夏盆地中含化石相当稀少的地层,S.guangheensis的发现为确定该组的地层时代提供了新的依据。
A new species of crown deer (Stephanocemas guangheensis sp.) Was established according to one adult antler, three cheek teeth, one talus and one calcaneus found in the middle and early Miocene Dongxiang Formation in Linxia Basin, Gansu Province. .nov.). It is a relatively small-sized species in Crown deer and its antler is significantly clawed with 6 angle branches in adult individuals. The new antlers are distinguished from other known species of crown deer, such as medium-sized palms and upwardly extending lateral branches; the ventral horn of the palms has a short horn that is semicircular semicircular in cross-section Shaped; unclosed shedding scars concave and covered with sponge-like pores. S. guangheensis progresses more than S. alalensis and S. agauensis in the late Early Miocene but is more primitive than S. palmatus in the Miocene. The Dongxiang Formation is a stratum with very few fossils in the Linxia Basin. The discovery of S. guangheensis provides a new basis for determining the age of the formation in this group.