Virtual reconstruction of the neurocranial anatomy of Kansajsuchus extensus (Neosuchia: Paralligatoridae) from the Upper Cretaceous of Tadzhikistan with a review of braincase osteology in Neosuchia

IF 1.9 3区 地球科学 Q1 GEOLOGY
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Abstract

The braincase features appear phylogenetically informative and key in assessing the still contentious relationships within Crocodylomorpha. Yet, the neurocrania of many non-crocodylian taxa are imperfectly studied. In the present paper, we describe the braincase osteology and neuroanatomy of a paralligatorid crocodylomorph Kansajsuchus extensus from the Upper Cretaceous Kansai locality in Tadzhikistan based on CT-scanning, segmentation, and 3D modeling. The detailed comparison of K. extensus with other taxa expands our understanding of the neurocranial anatomy and evolution in Neosuchia. The braincase anatomy appears to be relatively consistent across most non-crocodylian neosuchians, but important changes in its structure are traced through the neosuchian–eusuchian transition and especially at the base of Crocodylia. We question the close affinities of Dyrosauridae and Pholidosauridae based on significant differences in their braincases.

塔吉克斯坦上白垩世Kansajsuchus extensus(新蜥形目:短吻鳄科)神经颅骨解剖虚拟重建及新蜥形目脑壳骨学综述
脑壳特征似乎具有系统发育信息,是评估鳄形目内仍有争议的关系的关键。然而,许多非鳄类类群的神经颅研究并不完善。在本文中,我们基于CT扫描、分段和三维建模,描述了来自塔吉克斯坦上白垩世关西地区的副鳄形目Kansajsuchus extensus的脑壳骨学和神经解剖学。K.extensus与其他类群的详细比较扩展了我们对新蜥形纲神经颅骨解剖和进化的了解。在大多数非鳄形目新蜥形目中,脑壳的解剖结构似乎相对一致,但在新蜥形目-巨蜥形目过渡时期,特别是在鳄形目底部,脑壳的结构发生了重要变化。我们根据恐龙科和棘龙科脑壳的显著差异,对它们的近亲关系提出质疑。
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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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