Updated cranial and mandibular description of the Late Cretaceous (Maastrichtian) baenid turtle Saxochelys gilberti based on micro-computed tomography scans and new information on the holotype-shell association

IF 3 2区 地球科学 Q1 PALEONTOLOGY
Gaël E. Spicher, Tyler R. Lyson, Serjoscha W. Evers
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Abstract

Saxochelys gilberti is a baenid turtle from the Late Cretaceous Hell Creek Formation of the United States of America known from cranial, shell, and other postcranial material. Baenid turtles are taxonomically diverse and common fossil elements within Late Cretaceous through Eocene faunas. Detailed anatomical knowledge is critical to understanding the systematics and morphological evolution of the group. This is particularly important as baenids represent an important group of continental vertebrates that survived the mass extinction event associated with the Cretaceous/Paleogene boundary. High-resolution micro-computed tomography scanning of the holotype skull reveals additional anatomical details for the already well-known Saxochelys gilberti. This includes the revision of some anatomical statements from the original description, but also detailed knowledge on internal anatomical features of the braincase and the description of a well-preserved axis (cervical vertebra 2). Our new detailed description and previous work on the shell and postcrania make Saxochelys one of the best-described, nearly complete baenid turtles, which are often only known from either isolated shell or cranial material. A revised phylogenetic analysis confirms the position of Saxochelys gilberti as a derived baenid (Eubaeninae) more closely related to Baena arenosa than to Eubaena cephalica.
基于微型计算机断层扫描和关于主模式与贝壳关联的新信息,更新晚白垩世(马斯特里赫特)贝类海龟 Saxochelys gilberti 的头骨和下颌骨描述
Saxochelys gilberti 是一种产自美国晚白垩世地狱溪地层的海龟,根据颅骨、贝壳和其他颅后材料可知。在晚白垩世至始新世的动物群中,鳖类在分类上多种多样,是常见的化石元素。详细的解剖学知识对于了解该类群的系统学和形态演变至关重要。这一点尤为重要,因为白垩纪/古近纪边界大灭绝事件中幸存下来的一个重要大陆脊椎动物类群就是蟒蛇类。对主模式头骨的高分辨率微型计算机断层扫描揭示了已经广为人知的 Saxochelys gilberti 的更多解剖细节。这包括对原始描述中的一些解剖说明的修订,以及对脑壳内部解剖特征的详细了解和对一个保存完好的轴的描述(颈椎2)。我们新的详细描述以及之前在壳和颅后的研究工作使萨克索氏龟成为描述最完整、几乎完整的巴氏龟类之一,而这些龟类通常只能从孤立的壳或颅骨材料中获知。经过修订的系统发育分析确认了 Saxochelys gilberti 的位置,它是一种衍生的海龟类(Eubaeninae),与 Baena arenosa 的亲缘关系比与 Eubaena cephalica 的亲缘关系更近。
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来源期刊
Swiss Journal of Palaeontology
Swiss Journal of Palaeontology Earth and Planetary Sciences-Paleontology
CiteScore
4.30
自引率
16.70%
发文量
17
审稿时长
4 weeks
期刊介绍: The Swiss Journal of Palaeontology publishes original research and review articles of interest to the international community in the fields of palaeontology, taxonomy and systematics, while recognising at the same time the importance of documenting high-quality palaeontological data in a regional context. Palaeobiology in combination with alpha taxonomy is a core topic of the journal. Submitted papers should have an appeal as wide as possible, directed towards an international readership. Contributions should not have been simultaneously submitted elsewhere, and the overlap of content between related articles should be minimal. Duplications of text and the use of previously published illustrations without adequate citation are unacceptable. If a manuscript has two or more authors, both or all have to sign to confirm they all were involved in the work and have agreed to its submission. The preferred manuscript language is UK English, but consistently used US English is also acceptable. We encourage the publication of proceedings of international meetings as well as special thematic issues. Short contributions and book reviews are also accepted. An international editorial team as well as guest editors guarantee that the thematic issues as well as all articles in regular issues are peer-reviewed and meet the highest standards.
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