内蒙古鄂托克旗早白垩世龟类化石一新种  

A New Early Cretaceous Turtle from Otog Qi,Inner Mongolia,China

作　　者：姬书安[1] 陈晓云[2] JI Shu＇an;CHEN Xiaoyun(） Institute of Geology, Chinese Academy of Geological Sciences, Beijing , 100037;） The Geological Museum of China, Beijing, 100034)

机构地区：[1]中国地质科学院地质研究所,北京100037 [2]中国地质博物馆,北京100034

出　　处：《地质学报》2018年第4期629-637,共9页Acta Geologica Sinica

基　　金：国家自然科学基金项目"内蒙古鄂尔多斯地区早白垩世脊椎动物群及相关地层对比"(编号41372026);中国地质调查局地质调查项目"关键地区区域地层标准建立与关键生物群演化和沉积岩试点填图"(编号DD20160120)资助的成果

摘　　要：内蒙古鄂尔多斯地区早白垩世地层中产有丰富的龟类化石,本文记述了鄂托克旗查布一带泾川组的一件龟类背甲,其近六边形的第3椎盾宽为长的2倍且其前侧缘长约为后侧缘长的1.7倍、第8对肋板在中线处相接、第1上臀板宽大、侧棘发达等组合特征,表明其不同于中国龟属Sinemys的已知种,被命名为查布中国龟(新种)Sinemys chabuensis sp.nov.。龟类在鄂尔多斯地区早白垩世恐龙动物群中具有较高的分异度,志丹群泾川组和罗汉洞组中各发现至少2个种的龟类,它们既有继承性又有差异性,为研究中国龟类(sinemydids)的演化提供重要依据。Abundant fossil turtles have been known from the Early Cretaceous deposits of the Ordos region,Inner Mongolia.A new species of Sinemys,S.chabuensis sp.nov.,is erected based on a nearly complete turtle carapace that was excavated from the Jingchuan Formation of Otog Qi,Ordos.This species is characterized by its very wide third vertebral scute with its width doubling its length and its length of anterior lateral margin 1.7 times the length of posterior lateral margin,the contact between the paired eighth pleural plates at midline,very broad first suprapygal plate,and the very developed lateral spine from the seventh peripheral plate.At least two turtle species have been reported from the Early Cretaceous Jingchuan Formation and other two taxa from the underlying Luohandong Formation from Ordos region,respectively.There appear some successions and differences of the turtles between the two formations.

关 键 词：中国龟属 早白垩世 泾川组 鄂托克旗 鄂尔多斯盆地 

分 类 号：Q915.2[天文地球—古生物学与地层学]