陕西鄂尔多斯盆地中三叠统一离片椎类牙齿化石  

A Temnospondyl tooth from the Middle Triassic of the Ordos Basin,Shaanxi Province

作　　者：武瑞[1] 涂黎[2] 韩凤禄[1] WU Rui;TU Li;HAN Feng-Lu(School of Earth Sciences,China University of Geoscience(Wuhan),Wuhan 430074;Exploration&Development Research Institute,Henan Oil field Company SINOPEC,Nanyang 473132)

机构地区：[1]中国地质大学(武汉)地球科学学院,武汉430074 [2]中国石化河南油田分公司勘探开发研究院,南阳473132

出　　处：《古脊椎动物学报（中英文）》2022年第1期54-58,共5页Vertebrata Palasiatica

基　　金：国家自然科学基金基础科学中心项目(批准号:41688103)资助。

摘　　要：陕西省鄂尔多斯盆地渭北油田中三叠统铜川组发现一枚牙齿化石。该枚牙齿具有如下特征:牙齿细长,外形呈圆锥形,齿冠基部横截面为圆形,齿冠整体较直,沿长轴稍微向后缘弯曲,齿冠表面无齿脊和锯齿分布,发育纵向延伸的沟槽状纹饰。通过与鳄型类、蛇颈龙类和离片椎类的牙齿比较,该标本可以归入离片椎类。这枚牙齿化石为这一类群在中三叠统铜川组的首次发现,代表了离片椎类在华北板块最晚的化石记录。An isolated large temnospondyl tooth was discovered from the Middle Triassic Tongchuan Formation, Weibei Oilfield, Ordos Basin, Shaanxi Province of China. Compared with the teeth of crocodylomorphs, plesiosaurs and temnospondyls, the tooth can be referred to temnospondyl based on the following features: the crown is elongated and recurved with a circular cross-section;there are no denticles or carinae on the crown;well-marked apicobasal grooves are shown on the crown surface. This tooth represents the first temnospondyl found in the Middle Triassic Tongchuan Formation and is the youngest fossil record of temnospondyls in the North China Block.

关 键 词：鄂尔多斯盆地 中三叠世 铜川组 离片椎类 牙齿 

分 类 号：Q915.863[天文地球—古生物学与地层学]