The first complete description of the holotype of Brachylophosaurus canadensis Sternberg, 1953 (Dinosauria: Hadrosauridae) with comments on intraspecific variation
The first complete description of the holotype of Brachylophosaurus canadensis Sternberg, 1953 (Dinosauria: Hadrosauridae) with comments on intraspecific variation
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DOI：
10.1111/j.1096-3642.2009.00612.x
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发表时间：
2010-06-01
影响因子：
2.8
通讯作者：
Holmes, Robert B.
中科院分区：
文献类型：
--
作者：
Cuthbertson, Robin S.;Holmes, Robert B.
加拿大短剑龙的全型化石由c.m. Sternberg于1936年从加拿大阿尔伯塔省的奥德曼组（上白垩纪）收集，并于1953年对其头盖骨作了简要描述。对这具完整骨架的重新描述证实了它是鸭嘴龙恐龙的位置，表现出以下独特的特征组合：桨状固体鼻峰；后拉长的前额；只有泪腺的前端与上颌骨接触；极其拉长的前上颌突；方肌的后缘是非新月状的形成了方肌的准二次孔。将该全型标本与该分类群的其他标本进行比较，可以发现许多形态上的差异。这些可变特征包括有/没有副上颌前孔、上颌/牙列垂直牙列的数量、每排牙列构成牙合面功能牙齿的数量、形成下颌关节盂的骨骼、有/没有鼻孔、鼻嵴形态、颈椎数量和轴形态。(C) 2010伦敦林奈动物学会，林奈动物学报，2010,159,373 -397。doi: 10.1111 / j.1096-3642.2009.00612.x
The holotype of Brachylophosaurus canadensis was collected by C. M. Sternberg in 1936 from the Oldman Formation (Upper Cretaceous) of Alberta, Canada, with a brief description focusing on the cranium following in 1953. A re-description of the holotype skeleton confirms its position as a hadrosaurine dinosaur exhibiting the following unique combination of characters: paddle-like solid nasal crest; posteriorly elongated prefrontal; only the anterior tip of the lacrimal contacting maxilla; extremely elongated anterior maxillary process; and a quadratojugal with a noncrescentic posterior margin variably forming a paraquadratic foramen with the quadrate. Comparison of the holotype with other specimens assigned to the taxon reveals numerous morphological differences. These variable features include the presence/absence of an accessory premaxillary foramen, the number of maxillary/dentary vertical tooth rows, the number of functional teeth per tooth row contributing to the dental occlusal surface, the bones forming the mandibular glenoid, the presence/absence of a nasal foramen, nasal crest morphology, the number of cervical vertebrae, and axis morphology. (C) 2010 The Linnean Society of London, Zoological Journal of the Linnean Society, 2010, 159, 373-397.doi: 10.1111/j.1096-3642.2009.00612.x