内蒙古阿拉善地区似希腊鼻原角龙Protoceratops hellenikorhinus化石新材料  

New Materials of Protoceratops hellenikorhinus(Neoceratopsia:Protoceratopsidae)in Alxa Region,Inner Mongolia

作　　者：郭斌 马飞敏 姬书安[2] GUO Bin;MA Feimin;JI Shu’an(Inner Mongolia Museum of Natural History,Hohhot 010010,Inner Mongolia,China;Key Laboratory of Stratigraphy and Palaeontology of the Ministry of Natural Resources,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China)

机构地区：[1]内蒙古自然博物馆,内蒙古呼和浩特010010 [2]中国地质科学院地质研究所,自然资源部地层与古生物重点实验室,北京100037

出　　处：《西北地质》2024年第6期127-135,共9页Northwestern Geology

基　　金：国家自然科学基金项目“内蒙古阿拉善地区晚白垩世原角龙类动物群研究”(41872026)资助。

摘　　要：发现于内蒙古自治区阿拉善右旗巴音塔拉上白垩统乌兰苏海组(坎潘阶)中的3件原角龙类化石新标本,不同程度地保存了头部骨骼。其头骨较大、前颌骨齿不存在、上颌骨侧面的横向嵴近于水平且发育程度相对较弱、齿骨腹缘近于平直,显示出似希腊鼻原角龙Protoceratops hellenikorhinus的特征,应归入这一属种。阿拉善右旗巴音塔拉目前仅识别出1个属种的原角龙科化石——似希腊鼻原角龙,这一地区也成为该属种在乌拉特后旗巴音满都呼之后的第2个产出地点。似希腊鼻原角龙在巴音塔拉和巴音满都呼的恐龙动物群中均是数量占优势的分子,显示两地恐龙动物群的可对比性,同时进一步表明在晚白垩世坎潘期,内蒙古西部存在一个面积广阔、古地理环境相似的区域,该区域内不同地点的恐龙类群可以相互交流。Three new specimens of protoceratopsid skulls have been discovered recently from the Late Cretaceous Wulansuhai Formation(Campanian)at Bayan Tal locality in Alxa Right Banner,western Inner Mongolia Autonomous Region,northern China.The skull is relatively large,with premaxillary teeth absent.The craniocaudally arranged ridge on the lateral surface of maxilla is generally straight,and comparatively reduced.The ventral edge of dentary is nearly straight.These specimens show the representative characters only present in Protoceratops hellenikorhinus,thus should be assigned to this taxon.Only one genus and species of Protoceratopsidae has been confirmed,i.e.Protoceratops hellenikorhinus,at Bayan Tal locality.This locality becomes the second site yielding P.hellenikorhinus,following Bayan Mandahu locality in Urad Rear Banner,western Inner Mongolia.This protoceratopsid species was the dominant element among the dinosaur faunas at both Bayan Tal and Bayan Mandahu localities,which provides more paleontological evidences for the Late Cretaceous dinosaur faunal similarity between the two sites.P.hellenikorhinus has been only known at Bayan Tal and Bayan Mandahu localities during the Campanian,Late Cretaceous.This fact indicates that there may have existed a vast region in similar paleoenvironment across the western Inner Mongolia at that time,and that the dinosaurs could exchange easily within the region.

关 键 词：原角龙科 似希腊鼻原角龙 晚白垩世 乌兰苏海组 阿拉善右旗 

分 类 号：P52[天文地球—古生物学与地层学]