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首页> 外文会议>Royal Tyrrell Museum Ceratopsian Symposium >A Redescription of the Montanoceratops cerorhynchus Holotype with a Review of Referred Material
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A Redescription of the Montanoceratops cerorhynchus Holotype with a Review of Referred Material

机译：蒙纳洛山牛奶库麦考白的重新分析，具有综述引用材料

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THE BASAL NEOCERATOPSIAN Montanoceratops cerorhynchus has historically been interpreted as a close relative of Ceratopsidae by some authors, based on several shared synapomorphies such as the presence of a nasal horn and a reduced laterotemporal fenestra. Only fragments of the skull were recovered with the holotype specimen, however, and were embedded in a plaster reconstruction that hindered detailed examination of these bones. Dismantling of this cranial reconstruction has led to reidentification of some skull parts, especially those purportedly exhibiting ceratopsid traits. The nasal horn is here re-identified as a jugal horn, and several previously undescribed or unrecognized cranial elements, such as a premaxilla, are also figured and described here. The preserved cranial parts exhibit a suite of derived characters shared with other members of Leptoceratopsidae, and phylogenetic analysis posits Montanoceratops cerorhynchus as a leptoceratopsid more derived than Cerasinops, and sister to a more exclusive lade of leptoceratopsids with highly curved mandibles. A review of specimens referred to Montanoceratops over the last decade finds weak support for assignment to the genus for two of the specimens ( MOR 542; AMNH 5244), but not in the case of a third specimen (RTMP 88.11.1). Recent discoveries indicate that leptoceratopsid diversity in CampanianMaastrichtian rocks of western North America approaches that observed in centrosaurine ceratopsians of equivalent age and geographic distributions, and the former view of these animals as a relict holdover from older faunas can no longer be supported.
机译：基底NEOCERATOPSIAN蒙大拿角龙属cerorhynchus历来解释为由一些作者角龙科的近亲，基于几个共享共有衍征如鼻角的存在和减小laterotemporal窗孔。头骨的碎片回收与正模标本，但是，并嵌入在石膏重建受到阻碍详细的骨头的检查。这个颅骨重建的拆除导致了一些头骨的部分，尤其是那些据称参展ceratopsid特质的重新识别。鼻角是在这里重新识别为馗喇叭，和几个以前未描述或无法识别颅元件，例如一个前颌骨，也想通和这里描述的。所保存的颅部件表现出与套件纤角龙科的其他成员，和系统发育分析的posits蒙大拿角龙属cerorhynchus作为除了斗吻角龙属更衍生的leptoceratopsid，和妹妹共享与高度弯曲的下颌骨leptoceratopsids的更独家拉德衍生字符。标本进行审查简称蒙大拿角龙属在过去十年中发现用于分配给两个标本的属（MOR 542; AMNH 5244）支撑乏力，但不是在第三个标本（RTMP 88.11.1）的情况下。最近的发现表明在北美西部的CampanianMaastrichtian岩石leptoceratopsid多样化做法，在相当于年龄和地理分布，以及这些动物从旧的动物群孑遗缓缴的前一种观点的尖角龙亚科角龙类可观察到不再支持。

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