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Re-description of the sauropod dinosaur Amanzia (“Ornithopsis/Cetiosauriscus”) greppini n. gen. and other vertebrate remains from the Kimmeridgian (Late Jurassic) Reuchenette Formation of Moutier, Switzerland
Swiss Journal of Geosciences ( IF 3.1 ) Pub Date : 2020-02-24 , DOI: 10.1186/s00015-020-00355-5
Daniela Schwarz , Philip D. Mannion , Oliver Wings , Christian A. Meyer

Dinosaur remains were discovered in the 1860’s in the Kimmeridgian (Late Jurassic) Reuchenette Formation of Moutier, northwestern Switzerland. In the 1920’s, these were identified as a new species of sauropod, Ornithopsis greppini, before being reclassified as a species of Cetiosauriscus (C. greppini), otherwise known from the type species (C. stewarti) from the late Middle Jurassic (Callovian) of the UK. The syntype of “C. greppini” consists of skeletal elements from all body regions, and at least four individuals of different sizes can be distinguished. Here we fully re-describe this material, and re-evaluate its taxonomy and systematic placement. The Moutier locality also yielded a theropod tooth, and fragmentary cranial and vertebral remains of a crocodylomorph, also re-described here. “C.” greppini is a small-sized (not more than 10 m long) non-neosauropod eusauropod. Cetiosauriscus stewarti and “C.” greppini differ from each other in: (1) size; (2) the neural spine morphology and diapophyseal laminae of the anterior caudal vertebrae; (3) the length-to-height proportion in the middle caudal vertebrae; (4) the presence or absence of ridges and crests on the middle caudal centra; and (5) the shape and proportions of the coracoid, humerus, and femur. These anatomical differences, combined with their discrepancy in stratigraphic age, make it unlikely that C. stewarti and “C.” greppini belong to the same genus, as also supported through our phylogenetic analysis. “C.” greppini cannot be assigned to any other contemporaneous sauropod taxon from Europe, but is diagnosed by an autapomorphic rugosity on the posteromedial margin of the humerus, as well as a unique combination of features. As such, we erect the new genus name Amanzia for the Swiss taxon “Ornithopsis” greppini, augmenting the growing diversity of Late Jurassic European sauropods. Our phylogenetic analysis places it outside of Neosauropoda, either as the sister taxon to that clade, or as a member of Turiasauria.

中文翻译:

蜥脚类恐龙Amanzia(“ Ornithopsis / Cetiosauriscus ”)greppini的重新描述。gen。和其他脊椎动物的遗骸,来自瑞士穆蒂尔的基默尔第纪(侏罗纪晚期)鲁谢内特组

在1860年代在瑞士西北部Moutier的Kimmeridgian(侏罗纪晚期)Reuchenette组中发现了恐龙遗骸。在1920年代,它们被鉴定为蜥脚类恐龙的一个新物种,即虎耳草,然后被重新归类为Cetiosauriscus(C. greppini),否则从中侏罗世晚期(Callovian)的类型种(C. stewarti)已知。英国。“ C. greppini”由身体各个部位的骨骼组成,至少可以区分四个不同大小的个体。在这里,我们完全重新描述该材料,并重新评估其分类法和系统放置。Moutier地区也产生了兽脚类动物的牙齿,以及鳄鱼形的残存的颅骨和椎骨碎片,在此也进行了重新描述。“C。greppini是一种小型(不超过10 m长)的非神经足类真人足纲动物。斯图尔蒂斯古猿和“ C.” greppini的不同之处在于:(1)大小;(2)前尾椎的神经脊柱形态和po干椎板;(3)中尾椎骨的长高比例;(4)在中尾中央有无脊和峰;(5)喙突,肱骨和股骨的形状和比例。这些解剖上的差异,再加上地层年龄的差异,使得斯图尔蒂角and和“ C”不太可能出现。greppini属于同一属,我们的系统进化分析也支持该属。“C。” greppini无法分配给来自欧洲的任何其他同期蜥脚类动物分类单元,但可以通过肱骨后内侧边缘的凹凸不平的皱缩以及特征的独特组合来诊断。因此,我们为瑞士分类群“ Ornithopsis” greppini设立了新的属名Amanzia,从而增强了晚侏罗纪欧洲蜥脚类动物的多样性。我们的系统发育分析将其放置在新鳞足纲以外,作为该进化枝的姊妹分类群,或作为杜鹃花的成员。
更新日期:2020-02-24
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