虔州豫俊兽(Yubaatarqianzhouensissp.nov.):江西赣州盆地首例晚白垩世哺乳动物化石*

本文报道了产自江西省赣州市上白垩统赣县河口组的一件多瘤齿兽类标本, 这是江西省报道的首例中生代哺乳动物化石。此标本头骨后部横向扩展, 额骨较小, 后端尖并构成眼眶的内侧边缘, M1具三列齿尖, 系统发育分析支持其归入纹齿兽超科。与河南晚白垩世的中原豫俊兽形态较为相似, 但是两者间也存在一些明显的区别, 因此建立一个豫俊兽属新种——虔州豫俊兽(Yubaatar qianzhouensis sp. nov.), 鉴定特征为: m1齿尖式为7︰6; M2齿尖式为1︰3︰3; m1颊侧后部存在一道小脊; 虔州豫俊兽m2和m1的长度比例小于中原豫俊兽; 冠状突呈楔状, 末端尖。虔州豫俊兽的发现不仅扩展了晚白垩世多瘤齿兽类在东亚地区的地理分布和物种多样性, 并且也扩展了中生代哺乳动物的地理分布。

A new multituberculate, Yubaatar qianzhouensis sp. nov.: the first Late Cre-taceous mammal from Ganzhou Basin, Jiangxi Province

The Multituberculata represents one of the most successful groups of mammals that lived in the Mesozoic and early Cenozoic. More than 10 genera have been reported from North China, but there are still no records of this group from South China. Ganzhou Basin in Jiangxi Province has been reported to be rich in vertebrate fossils, but no mammals have previously been found there. Here, we report a new multituberculate, Yubaatar qianzhouensis sp. nov., from the Upper Cretaceous Hekou Formation of Ganxian County, Ganzhou City, Jiangxi Province, China. This taxon represents the first known multituberculate from South China.