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首页> 外文期刊>Canadian journal of earth sciences >A new species of Chasmosaurus (Dinosauria: Ceratopsia) from the Dinosaur Park Formation of southern Alberta
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A new species of Chasmosaurus (Dinosauria: Ceratopsia) from the Dinosaur Park Formation of southern Alberta

机译：来自亚伯达省南部的恐龙公园形成的一种新的龙属恐龙（恐龙属：角龙属）

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摘要

Chasmosaurus irvinensis (sp. nov.) is distinguished from other species of this genus by the possession of a broad snout, absence of a brow horn (the position of which is occupied by a pit or rugosities suggestive of bone resorption), broadly rounded and open jugal notch, subrectangular squamosal, straight posterior parietal bar bearing 10 epoccipitals, eight of which are flattened, strongly curved anterodorsally, and nearly indistinguishably coossified to their neighbours, and small, transversely oriented parietal fenestrae restricted to the posterior portion of the frill. This species, restricted to the upper part of the Dinosaur Park Formation, is significantly younger than the other recognized Canadian Chasmosaurus species, C. belli and C. russelli. Phylogenetic analysis shows that C. irvinensis is most closely related to the other Canadian Chasmosaurus species and more distantly related to Chasmosaurus mariscalensis from Texas.
机译：Chasmosaurus irvinensis（sp。nov。）与该属其他物种的不同之处在于，它拥有宽阔的鼻子，没有额头角（其位置被凹陷或暗示骨骼吸收的皱纹占据），大致圆形和圆形。开放的法式凹口，矩形下鳞状，直的后壁顶杆，有10个枕骨，其中8个是扁平的，前侧呈强烈弯曲，与周围的邻居几乎没有明显的粘在一起，而小而横向的顶壁壁孔则限制在褶边的后部。该物种仅限于恐龙公园组的上部，比其他公认的加拿大蛇龙物种C. belli和C. russelli要年轻得多。系统发育分析表明，欧文C. irvinensis与其他加拿大Chasmosaurus物种关系最密切，与得克萨斯州的Marischasaurus mariscalensis关系更远。

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