A REDESCRIPTION OF THE ANKYLOSAURID DINOSAUR DYOPLOSAURUS ACUTOSQUAMEUS PARKS, 1924 (ORNITHISCHIA: ANKYLOSAURIA) AND A REVISION OF THE GENUS
A REDESCRIPTION OF THE ANKYLOSAURID DINOSAUR DYOPLOSAURUS ACUTOSQUAMEUS PARKS, 1924 (ORNITHISCHIA: ANKYLOSAURIA) AND A REVISION OF THE GENUS
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DOI：
10.1671/039.029.0405
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发表时间：
2009-12-12
影响因子：
1.4
通讯作者：
Sissons, Robin L.
中科院分区：
文献类型：
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作者：
Arbour, Victoria M.;Burns, Michael E.;Sissons, Robin L.
Dyoplosaurus acutosquameus Parks 的正模标本，1924 年（=Euoplocephalus tutus Lambe，1910 年）。代表了迄今为止收集的最完整的甲龙标本之一。它由部分头骨顶部、四个下颌骨碎片（其中两颗牙齿在原位）、部分后甲（一些在原位）、皮肤印模、铰接的后胸椎骨、十根部分胸肋骨、部分左髂骨、坐骨和尾棒以及相关的右桡骨、左第四掌骨、股骨、胫骨、腓骨和小腿组成。我们对该材料进行了详细的重新描述，并与其他甲龙科 E. tutus 标本进行了比较。不支持该属与 Euoplocephalus 的同义词，并且 Dyoplosaurus 是一个有效的分类单元。真头龙正模标本的碎片性质可能导致白垩纪晚期北美甲龙的多样性低于实际情况。因此，为了准确评估各种甲龙类群的数量和性质，可能有必要超越传统的颅骨特征。
The holotype of Dyoplosaurus acutosquameus Parks, 1924 (=Euoplocephalus tutus Lambe, 1910). represents one of the most complete ankylosaurid specimens collected to date. It consists of a partial skull roof, four mandible fragments with two teeth in situ, portions of posteranial armor (some in situ), skin impressions, articulated post-thoracic vertebrae, ten partial thoracic ribs, a partial left ilium, both ischia, and tail club, and associated right radius, left metacarpal IV, femur, tibia, fibula, and pes. We provide a detailed redescription of this material as well as comparisons with other ankylosaurid specimens referred to E. tutus. The synonymy of the genus with Euoplocephalus is not supported, and Dyoplosaurus is a valid taxon. It is possible that the fragmentary nature of the holotype of Euoplocephalus leads to the inference that the diversity of Late Cretaceous North American ankylosaurids is lower than it actually is. As such, it might be necessary to look beyond traditional cranial characters in order to accurately appraise the number and nature of various ankylosaurid taxa.