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首页> 外文期刊>Journal of Systematic Palaeontology >Skeletal morphology of Kritosaurus navajovius (Dinosauria: Hadrosauridae) from the Late Cretaceous of the North American south-west, with an evaluation of the phylogenetic systematics and biogeography of Kritosaurini
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Skeletal morphology of Kritosaurus navajovius (Dinosauria: Hadrosauridae) from the Late Cretaceous of the North American south-west, with an evaluation of the phylogenetic systematics and biogeography of Kritosaurini

机译：来自北美西南白垩纪晚期的Kritosaurus navajovius（Dinosauria：Hadrosauridae）的骨骼形态，并对Kritosaurini的系统发育系统和生物地理学进行了评估

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The osteology of the hadrosaurid dinosaur Kritosaurus navajovius (late Campanian of southern North America) is documented in detail, and the taxonomy and phylogenetic relationships of the genus are revised. Kritosaurus is rediagnosed based on the extensive length of the dorsolateral margin of the maxilla and a unique combination of characters that includes a jugal with orbital constriction deeper than infratemporal one, infratemporal fenestra greater than orbit and with dorsal margin greatly elevated above dorsal orbital margin in adults, frontal participating in orbital margin, and paired caudal parasagittal processes of nasals resting over frontals. The taxonomy of numerous hadrosaurid specimens previously referred to Kritosaurus is reassessed; the vast majority of these cannot be positively referred to Kritosaurus. One exception is a specimen collected from the Cerro del Pueblo Formation that extends the geographical range of K. navajovius further south in Laramidia, to present-day northern Mexico. Anasazisaurus is regarded a junior synonym of Kritosaurus; their holotypes are indistinguishable from each other when considering the overlapping elements. However, many characters support distinction of Naashoibitosaurus ostromi as a valid taxon. Kritosaurus, consisting of the sister species K. navajovius and K. horneri, is deeply nested within Saurolophinae as a member of Kritosaurini. The latter clade includes also Naashoibitosaurus, Gryposaurus, and the South American Secernosaurus. Kritosaurini is characterized by a rostral nasal dorsal process not reaching the rostral margin of the narial foramen, frontal with triangular rostrolateral projection ending in a narrow apex (convergent in Brachylophosaurini), and a subrectangular dorsal region of infratemporal fenestra, among other characters. Kritosaurin hadrosaurids are hypothesized to have originated in southern Laramidia no later than the early Campanian. Subsequently, members of the clade reached northern Laramidia and South America via dispersal no later than the early and late Campanian, respectively.
机译：详细记录了鸭嘴龙恐龙Kritosaurus navajovius（北美南部的坎帕尼阶）的骨学，并修改了该属的分类学和系统发育关系。根据上颌骨的后外侧边缘的宽阔长度和独特的字符组合对Kritosaurus进行了诊断，该字符的组合包括一个眶内压迫程度比颞下颌骨更深的颞下颌骨，颞下内窗大于眼眶的法律，并且背缘大大超过了成年人的背眶缘，额叶参与眼眶边缘，以及成对的额叶成对的尾状旁弓突。重新评估了以前称为角龙的许多鸭嘴龙标本的分类学；其中绝大部分都不能肯定地提及Kritosaurus。一个例外是从Cerro del Pueblo组收集的标本，该标本将K. navajovius的地理范围扩展到拉拉米迪亚的更南端，直至今天的墨西哥北部。 Anasazisaurus被认为是Kritosaurus的初级同义词。当考虑重叠元素时，它们的整体型是无法区分的。但是，许多字符都支持将Naashoibitosaurus ostromi区分为有效的分类单元。由姐妹物种K. navajovius和K. horneri组成的Kritosaurus作为Kritosaurini的一分子深深地嵌套在蜥脚目科中。后者包括鼻鼻龙，鹰龙和南美剑龙。 Kritosaurini的特征是鼻尖的鼻背突未到达鼻孔的鼻尖边缘，额叶的前额带三角形的tro侧突端（在Brachylophosaurini中会聚），以及颞下窗的矩形下背侧区域。据推测，Kritosaurin鸭嘴龙起源于拉曼底亚南部，最早出现在Campanian早期。随后，进化支成员分别在坎帕尼亚早期和晚期分别通过扩散到达了拉拉米迪亚北部和南美。

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