阿根廷巴塔哥尼亚Portezuelo组(上白垩纪)一种新的短肢龙abelisaurid(兽足目,角鼻龙目)

IF 2.3 2区 地球科学 Q1 PALEONTOLOGY
M. Baiano, D. Pol, F. Bellardini, G. J. Windholz, I. Cerda, A. Garrido, R. Coria
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引用次数: 5

摘要

阿贝利龙是一种中型兽脚亚目恐龙,在晚白垩纪冈瓦纳地区的食肉动物群中占主导地位。这些掠食者在巴塔哥尼亚的白垩纪化石地层中大量存在,为这一群体提供了最好的记录。在晚白垩纪,阿贝利龙出现在冈瓦纳的几乎所有地区和所有阶段,除了Coniacian,它们在全球范围内都是未知的。本文描述了阿根廷巴塔哥尼亚Turonian-Coniacian Portezuelo组的一种新abelisaurus, Elemgasem nubilus gen. et sp. nov.。对其尾骨的古组织学研究表明,该标本为亚成年个体,但已达到性成熟。该分类群以几个轴向和尾向元素为基础,并通过腓骨外侧表面和跟骨背侧深外侧壁上明显的皱襞模式的存在来诊断。此外,后尾椎骨的形态与其他阿贝龙略有不同。考虑到它是作为Furileusauria的姐妹分类单元或在该分支中的几个位置被恢复,因此在短肢动物纲中被恢复为一个不稳定的分类单元。尽管nubilus elgasem的系统发育关系存在问题,但它的重要性在于它是第一个来自Turonian-Coniacian区间的阿贝利龙,并且在南美洲四足动物群的显著更替、全球气候变化和世界范围内海洋领域的大规模灭绝事件中,它增加了这个兽脚亚目家族的多样性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Elemgasem nubilus: a new brachyrostran abelisaurid (Theropoda, Ceratosauria) from the Portezuelo Formation (Upper Cretaceous) of Patagonia, Argentina
Abelisaurids are medium–large‐sized theropod dinosaurs that were predominant in the carnivorous fauna during the Late Cretaceous of Gondwana. These predators are abundant in the Cretaceous fossil strata of Patagonia, which yield the best record for this group. In the Late Cretaceous, abelisaurids appear in almost all regions of Gondwana and in all stages, except for the Coniacian, in which they are globally unknown. Here we describe a new abelisaurid, Elemgasem nubilus gen. et sp. nov., from the Portezuelo Formation (Turonian–Coniacian), Patagonia, Argentina. The palaeohistology of the appendicular bones of Elemgasem shows that the holotype was a subadult individual, but had achieved sexual maturity. This taxon is based on several axial and appendicular elements, and is diagnosed by the presence of a marked pattern of rugosity on the lateral surface of the fibula and a dorsoventrally deep lateral wall of the calcaneum. Moreover, the posterior caudal vertebrae have a morphology slightly different from any other abelisaurid. Elemgasem nubilus is recovered as an unstable taxon within Brachyrostra, given that it was recovered as sister taxon of Furileusauria or in several positions within this clade. Despite the problematic phylogenetic relationships of Elemgasem nubilus, it is important because it is the first abelisaurid from the Turonian–Coniacian interval and it increases the diversity of this theropod family at a time of marked turnover in the tetrapod fauna of South America, global climate change, and mass extinction events recorded worldwide in the marine realm.
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来源期刊
Papers in Palaeontology
Papers in Palaeontology PALEONTOLOGY-
CiteScore
4.50
自引率
4.30%
发文量
55
期刊介绍: Papers in Palaeontology is the successor to Special Papers in Palaeontology and a journal of the Palaeontological Association (www.palass.org). The journal is devoted to the publication of papers that document the diversity of past life and its distribution in time and space. Papers in Palaeontology is devoted to the publication of papers that document the diversity of past life and its distribution in time and space. As a sister publication to Palaeontology its focus is on descriptive research, including the descriptions of new taxa, systematic revisions of higher taxa, detailed biostratigraphical and biogeographical documentation, and descriptions of floras and faunas from specific localities or regions. Most contributions are expected to be less than 30 pp long but longer contributions will be considered if the material merits it, including single topic parts. The journal publishes a wide variety of papers on palaeontological topics covering: palaeozoology, palaeobotany, systematic studies, palaeoecology, micropalaeontology, palaeobiogeography, functional morphology, stratigraphy, taxonomy, taphonomy, palaeoenvironmental reconstruction, palaeoclimate analysis, biomineralization studies.
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