A new ornithopod from the Upper Cretaceous (Huincul Formation) of northwestern Patagonia, Argentina: Implications on elasmarian postcranial anatomy

IF 1.9 3区 地球科学 Q1 GEOLOGY Cretaceous Research Pub Date : 2024-03-11 DOI:10.1016/j.cretres.2024.105874
Rodrigo Alvarez Nogueira , Sebastián Rozadilla , Federico L. Agnolín , Jordi A. Garcia Marsà , Matias J. Motta , Fernando E. Novas
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Abstract

The aim of the present contribution is to describe the first ornithischian species from the Huincul Formation (Cenomanian-Turonian, Upper Cretaceous) at the Pueblo Blanco Natural Reserve, Río Negro province, Argentina. The new species, named Chakisaurus nekul gen. et sp. nov., can be comfortably included among elasmarian ornithopods. The new species shows humeral anatomy that is congruent with smaller members of the clade (e.g. Anabisetia, Notohypsilophodon), and differs from larger taxa (e.g. Talenkauen, Mahuidacursor) which show humeral features probably related with graviportal habits, such as lack of shaft torsion and a distally located deltopectoral crest. This indicates that graviportal habits were probably acquired independently in elasmarians from other large-sized taxa, such as hadrosauroids. Caudal vertebrae of the new species also show a unique combination of characters shared with other elasmarians, which are absent in previously known ornithopods. These features indicate that some elasmarians had a protonic tail posture, which is unknown in other ornithischians and was previously considered unique to derived titanosaurian sauropods. The shape of transverse processes and neural spines of caudal vertebrae indicate that at least some elasmarians had improved cursorial habilities, that were convergently acquired by selected theropod clades.

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来自阿根廷巴塔哥尼亚西北部上白垩世(HUINCUL地层)的新兽脚类动物。对伶鼬颅后解剖学的影响
本报告旨在描述阿根廷里奥内格罗省普韦布洛布兰科自然保护区 Huincul Formation(仙人纪-土伦纪,上白垩世)中的首个兽脚类物种。该新物种被命名为新种(gen. et sp. nov.新种的肱骨解剖结构与该支系的小型成员(如)一致,而与大型类群(如)不同,大型类群的肱骨特征可能与重足生活习性有关,如缺乏轴扭转和位于远端的胸骨下嵴。这表明伶鼬的腹股沟习性很可能是独立于其他大型类群(如鼬属)而获得的。该新物种的尾椎骨还显示出与其他矛脚类共有的独特特征组合,而这些特征在以前已知的兽脚类中是不存在的。这些特征表明,一些elasmarians具有原尾姿态,这在其他鸟臀目动物中是未知的,以前曾被认为是衍生的泰坦龙类兽脚类特有的姿态。尾椎横突和神经刺的形状表明,至少有一些矛脚类具有改进的游动能力,而这些能力是由选定的兽脚类支系趋同获得的。
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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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