Chasmosaurus mariscalensis, sp. nov., a new ceratopsian dinosaur from Texas
Chasmosaurus mariscalensis, sp. nov., a new ceratopsian dinosaur from Texas
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海角开龙，sp。
DOI：
10.1080/02724634.1989.10011749
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发表时间：
1989
影响因子：
1.4
通讯作者：
T. Lehman
中科院分区：
文献类型：
--
作者：
T. Lehman
摘要开角龙是得克萨斯州布鲁斯特县大本德国家公园阿古亚组上部(晚坎帕尼亚期，朱迪斯期)发现的角龙新种。本物种与开角龙的其他物种的区别在于，它的相对短和宽的鳞片有六个非常大的枕头，没有明显的侧架的上颌，没有后气味延伸的前颌，和成年的非常长的眶上角心。由10-15个幼体、亚成体和完全成体的脱节遗骸组成的骨床堆积形成了大理石龙虾的下茎，并允许首次对该属的后颅骨进行全面描述。男性和女性是根据眉角方向来区分的。这是开角龙的最先进的种，并且在几个特征上与五角龙在形态上是中间的。
ABSTRACT Chasmosaurus mariscalensis is a new species of ceratopsian dinosaur (Ornithischia; Ceratopsia) from the upper part of the Aguja Formation (late Campanian, Judithian) in Big Bend National Park, Brewster County, Texas. This species is distinguished from other species of Chasmosaurus by its relatively short and broad squamosal bearing six very large epoccipitals, maxilla without pronounced lateral shelf, premaxilla without posterodorsal extension, and very long supraorbital horncores in adults. A bone bed accumulation comprising disarticulated remains of 10–15 juvenile, subadult, and fully adult individuals forms the hypodigm of C. mariscalensis, and allows the first full description of the postcranial skeleton for the genus. Males and females are separated on the basis of brow horncore orientation. This is the most advanced species of Chasmosaurus and is morphologically intermediate with Pentaceratops in several characters.