The tetrapod fauna of the upper Permian Naobaogou Formation of China: a new species of Elginia (Parareptilia, Pareiasauria)

The pareiasaur fossil record in China is poor compared to that of Russia or South Africa. A new pareiasaur specimen is here reported from the upper Permian Naobaogou Formation of the Daqing Mountains, Nei Mongol, China. It is recognized as a new species of Elginia, a taxon otherwise known only from the upper Permian Cutties Hillock Sandstone of Scotland. Diagnostic features include a moderately developed cheek flange; prominent otic notch (formed between squamosal and quadratojugal at the posterior margin of the temporal plate); enlarged supraorbital bosses on prefrontal, postfrontal, and postorbital; a hypertrophied supratemporal horn, and squamosal horn prominently projecting posteriorly from caudal margin of temporal plate. The new taxon is differentiated from E. mirabilis by a well-developed and crescentic postfrontal boss, which is the largest among a series of circumorbital bosses; upper orbital border distinctly domed with a smooth rather than angled anterodorsal margin; lesser d...

中国的副爬行动物（pareiasaur）化石记录相较于俄罗斯或南非较为匮乏。本文报道了采自中国内蒙古大青山上二叠统脑包沟组的一件新副爬行动物标本。该标本被鉴定为埃尔金龙属（Elginia）的一个新种，该属此前仅在苏格兰上二叠统卡蒂山丘砂岩中有记录。其鉴别特征包括：颊缘（cheek flange）发育中等；耳凹（otic notch）显著（由颞板（temporal plate）后缘的鳞状骨（squamosal）与方轭骨（quadratojugal）之间形成）；前额骨（prefrontal）、后额骨（postfrontal）及眶后骨（postorbital）上的眶上突（supraorbital bosses）扩大；颞上突角（supratemporal horn）肥大，且鳞状骨角（squamosal horn）从颞板尾缘向后显著突出；以及较小的d...