当前位置: X-MOL 学术Cretac. Res. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
A Benchmark Specimen Of Muiscasaurus Catheti From The Upper Aptian Of Villa De Leiva, Colombia: New Anatomical Features And Phylogenetic Implications
Cretaceous Research ( IF 1.9 ) Pub Date : 2021-03-01 , DOI: 10.1016/j.cretres.2020.104685
María Eurídice Páramo-Fonseca , Javier García-Guerrero , Cristian David Benavides-Cabra , Santiago Padilla-Bernal , Antonio José Castañeda-Gómez

Abstract A new specimen of Muiscasaurus catheti Maxwell et al., 2016 from upper Aptian of the Paja Formation found in Villa de Leiva (Boyaca, Colombia) is described herein. It consists of a well preserved skull and a nearly complete axial skeleton of a sub-adult individual and provides valuable new morphological information on the species, including two autapomorphies: the presence of a quadratojugal with extremely reduced external exposure, and basioccipital floor of the foramen magnum with a medially furrowed anterior ridge. A detailed comparison between the new specimen (FCG-CBP-16) and the holotype (CIP-FCG-CBP-74) allows us to identify misinterpretations in the original description of M. catheti that were probably due to the highly deformed and partially unprepared state of the holotype. Consequently, we propose the new specimen (FCG-CBP-16) to be a benchmark specimen for the species. Morphological comparisons with other Ophthalmosauridae highlight the affinities between M. catheti and the species of the Upper Jurassic genus Ophthalmosaurus. A phylogenetic analysis recovers M. catheti in a ‘basal’ position within Ophthalmosaurinae, supporting its proximity to Ophthalmosaurus and contrasting with previous topologies where M. catheti was recovered as a basal Platypterygiinae. This implies a temporal extension of the Ophthalmosaurinae up to the Aptian in South America.

中文翻译:

来自哥伦比亚德莱瓦别墅上阿普蒂安的 Muiscasaurus Catheti 的基准标本:新的解剖学特征和系统发育意义

摘要 本文描述了 2016 年在 Villa de Leiva(哥伦比亚博亚卡)发现的 Paja 组上部 Aptian 的 Muiscasaurus catheti Maxwell 等人的新标本。它由一个保存完好的头骨和一个亚成年个体的近乎完整的中轴骨骼组成,并提供了有关该物种的有价值的新形态信息,包括两个自体形态:存在极少外部暴露的四方颈椎,以及椎间孔的基底枕骨具有内侧皱纹的前脊的大酒瓶。新标本 (FCG-CBP-16) 和正模标本 (CIP-FCG-CBP-74) 之间的详细比较使我们能够确定 M. catheti 原始描述中的误解,这可能是由于高度变形和部分未准备好正模的状态。最后,我们建议将新标本(FCG-CBP-16)作为该物种的基准标本。与其他眼科龙科的形态学比较突出了 M. catheti 与上侏罗纪眼科龙属物种之间的亲缘关系。系统发育分析在 Ophthalmosaurinae 内的“基础”位置恢复了 M. catheti,支持其与 Ophthalmosaurus 的接近性,并与之前的拓扑结构形成对比,其中 M. catheti 被恢复为基底侧翼龙亚科。这意味着眼鲸亚科在时间上一直延伸到南美洲的 Aptian。catheti 在 Ophthalmosaurinae 中的“基础”位置,支持它与 Ophthalmosaurus 的接近性,并与以前的拓扑形成对比,其中 M. catheti 作为基础 Platypterygiinae 被回收。这意味着眼鲸亚科在时间上一直延伸到南美洲的 Aptian。catheti 在 Ophthalmosaurinae 中的“基础”位置,支持它与 Ophthalmosaurus 的接近性,并与以前的拓扑形成对比,其中 M. catheti 作为基础 Platypterygiinae 被回收。这意味着眼鲸亚科在时间上一直延伸到南美洲的 Aptian。
更新日期:2021-03-01
down
wechat
bug