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A new cranial reconstruction of Coelurosauravus elivensis Piveteau, 1926 (Diapsida, Weigeltisauridae) and its implications on the paleoecology of the first gliding vertebrates
Journal of Vertebrate Paleontology ( IF 1.4 ) Pub Date : 2021-07-12 , DOI: 10.1080/02724634.2021.1930020
Valentin Buffa 1 , Eberhard Frey 2 , J.-Sébastien Steyer 1 , Michel Laurin 1
Affiliation  

ABSTRACT

The cranial skeleton of the enigmatic gliding neodiapsid reptile Coelurosauravus elivensis (Lower Sakamena Formation, Lopingian, Southwestern Madagascar) is re-described in detail. All previously referred specimens are re-examined under both direct observations and Reflectance Transformation Imaging. Their exquisite preservation yields detailed three-dimensional information on the outline of individual bones and their osteological relationships, which are missing in the Laurasian remains. In contrast to previous studies, the ontogenetic maturity of all specimens is re-affirmed. Previously unidentified elements of the palate, braincase and mandible are described, and a novel reconstruction is proposed, including the first palatal reconstruction in a weigeltisaurid reptile. C. elivensis has the smallest skull of all weigeltisaurids and differs from other species in its facial ornamentation, parietosquamosal frill and larger anterior maxillary dentition. We also provide extensive comparisons with contemporaneous reptiles, possibly closely related taxa and more recent analogs, as well as a preliminary discussion of the functional anatomy of the peculiar cranial morphology of weigeltisaurids. The cranial skeleton is a truss construction with large orbits and temporal fenestrae. By analogy with extant chamaeleonids, the elongate parietosquamosal frill is associated with an increase in length and diameter of the temporal jaw adductors, resulting in an increased gape and/or bite force and speed. Additionally, the spikes and frills of weigeltisaurids most likely served as a display and defensive structure.



中文翻译:

Coelurosauravus elivensis Piveteau,1926(Diapsida,Weigeltisauridae)的新颅骨重建及其对第一批滑翔脊椎动物古生态学的影响

摘要

重新详细描述了神秘的滑翔新二类爬行动物Coelurosauravus elivensis(Lower Sakamena Formation, Lopingian, Southwestern Madagascar)的颅骨骨骼。所有先前提到的标本都在直接观察和反射变换成像下重新检查。它们精美的保存提供了关于单个骨骼轮廓及其骨学关系的详细三维信息,而这些信息在劳亚人遗骸中是缺失的。与之前的研究相反,所有标本的个体发育成熟度都得到了再次肯定。描述了先前未识别的上颚、脑壳和下颌骨的元素,并提出了一种新的重建方法,包括第一次对威格龙爬行动物进行上颚重建。C. elivensis威格龙科的头骨最小,在面部装饰、顶鳞状褶皱和较大的上颌前牙列方面与其他物种不同。我们还提供了与同时代爬行动物、可能密切相关的分类群和最近的类似物的广泛比较,以及对威格龙科动物特殊颅骨形态的功能解剖学的初步讨论。颅骨是具有大眼眶和颞窗孔的桁架结构。与现存的 chamaeleonids 类比,细长的顶鳞状褶边与颞颌内收肌的长度和直径增加有关,导致张口和/或咬合力和速度增加。此外,威格龙科动物的尖刺和褶边很可能是作为展示和防御结构。

更新日期:2021-09-15
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