埃及坎帕尼亚古赛尔地层出土的长吻龙类(鳄形目,中原龙科

IF 1.9 3区 地球科学 Q1 GEOLOGY
Sara Saber , Belal S. Salem , Khaled Ouda , Abdullah S. Gohar , Sanaa El-Sayed , Hesham M. Sallam
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引用次数: 0

摘要

恐龙科(Dyrosauridae)是新蜥形类鳄鱼的一个支系,是北非晚白垩世至古近纪陆地和水生生态系统的重要组成部分。在此,我们报告了从埃及西部沙漠南部哈尔加绿洲附近的中-上新世坎帕纪库赛尔地层中发掘出的一个恐龙下颌骨联合。这是一个下颌骨部分(MUVP 635),包括牙盘和脾盘,根据其牙齿形态、大小和联合中脾盘的形状被归类为恐龙科。MUVP 635 的齿槽直径短于同列的齿槽间距。此外,第七齿槽明显较大,与第四齿槽大小相当,而第六齿槽的位置靠近第七齿槽,与第八齿槽一样小,第八齿槽与第九齿槽相邻。系统发育分析将 MUVP 635 定义为恐龙科的早期分化成员,与其坎帕尼亚中晚期的年龄相符。MUVP635与Chenanisuchus lateroculi和Anthracosuchus balrogus被确定为棘龙科最基干成员的多系谱一致。在库塞尔地层发现的新的棘龙类材料将棘龙科的分布范围扩大到了坎帕尼亚中期,突显了棘龙科在北非的分类丰富性,并支持了该科起源于非洲的假说。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A long-snouted dyrosaurid (Crocodyliformes, Mesoeucrocodylia) from the Campanian Quseir Formation of Egypt

Dyrosauridae, a clade of neosuchian crocodyliforms, was a significant component of terrestrial and aquatic ecosystems across the latest Cretaceous to Paleogene of North Africa. Here, we report a dyrosaurid mandibular symphysis recovered from the middle–upper Campanian Quseir Formation near Kharga Oasis in the southern Western Desert of Egypt.

This is a partial mandible (MUVP 635), including dentaries and splenials, assigned to Dyrosauridae based on its dental pattern, size, and the shape of the splenial in the symphysis. MUVP 635 exhibits alveolar diameters shorter than the interalveolar distances within the same row. Moreover, the seventh dentary alveolus is significantly large, comparable in size to the fourth dentary alveolus, while the sixth dentary alveolus is positioned close to the seventh dentary alveolus and is as small as the eighth dentary alveolus, which is adjacent to the ninth dentary alveolus. Phylogenetic analysis places MUVP 635 as an early-diverging member of Dyrosauridae, consistent with its middle–late Campanian age. It aligns with a polytomy with Chenanisuchus lateroculi and Anthracosuchus balrogus identified as the most basal members of Dyrosauridae. The discovery of new dyrosaurid material in the Quseir Formation extends the range of Dyrosauridae to the middle Campanian, highlighting the taxonomic richness of the dyrosaurid clade across North Africa and supporting hypotheses of the African origin for this family.

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来源期刊
Cretaceous Research
Cretaceous Research 地学-地质学
CiteScore
4.10
自引率
19.00%
发文量
235
审稿时长
12 weeks
期刊介绍: Cretaceous Research provides a forum for the rapid publication of research on all aspects of the Cretaceous Period, including its boundaries with the Jurassic and Palaeogene. Authoritative papers reporting detailed investigations of Cretaceous stratigraphy and palaeontology, studies of regional geology, and reviews of recently published books are complemented by short communications of significant new findings. Papers submitted to Cretaceous Research should place the research in a broad context, with emphasis placed towards our better understanding of the Cretaceous, that are therefore of interest to the diverse, international readership of the journal. Full length papers that focus solely on a local theme or area will not be accepted for publication; authors of short communications are encouraged to discuss how their findings are of relevance to the Cretaceous on a broad scale. Research Areas include: • Regional geology • Stratigraphy and palaeontology • Palaeobiology • Palaeobiogeography • Palaeoceanography • Palaeoclimatology • Evolutionary Palaeoecology • Geochronology • Global events.
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