智利和阿根廷早白垩世Myobradypterygius hauthali von Huene, 1927(鱼龙目:眼龙科)的有效性

IF 3 2区 生物学 Q1 ZOOLOGY
Judith Pardo-Pérez, Patricio Zambrano, Matthew Malkowski, Dean Lomax, Rodrigo Villa-Martínez, Wolfgang Stinnesbeck, Eberhard Frey, Francisca Scapini, Cristina Gascó, Erin E Maxwell
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引用次数: 0

摘要

早白垩世的鱼龙是分布于全球的浮游海洋爬行动物,但许多遗骸都很零碎,造成了北半球多样性的偏差。在智利南部托雷斯德尔帕恩国家公园内的廷德尔冰川附近的一个丰富的豪特里维鱼龙化石地点,获得了有关冈瓦纳太平洋边缘鱼龙多样性的重要新数据。这些新数据将有助于澄清有关鱼龙分类学以及早白垩世冈瓦纳南部与北半球鱼龙类群之间古生物地理关系的问题。在这里,我们描述了产自这一地点的三件新鱼龙标本。其中两件标本被归入Myobradypterygius hauthali,从而将该物种的分布范围从阿根廷的巴雷姆期扩大到智利巴塔哥尼亚的豪特里维期。该材料表明,M. hauthali 与 Platypterygius platydactylus 在前鳍结构和肩胛形态上存在差异,支持将其划分为 Platypterygiinae 中的一个独立属。第三个标本是一种体型较大的不定型眼龙类鱼龙。该记录代表了眼龙科最南端的记录,也是该类群在南半球白垩纪的首次出现。这些发现表明,早白垩世期间,眼龙类和板鳃鱼龙类继续在冈瓦纳大陆最南端共生,将欧洲记录的模式扩展到了太平洋地区。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Validity of Myobradypterygius hauthali von Huene, 1927 (Ichthyosauria: Ophthalmosauria) from the Early Cretaceous of Chile and Argentina
Early Cretaceous ichthyosaurs were globally distributed pelagic marine reptiles, but many remains are fragmentary, creating a Northern Hemisphere diversity bias. A rich Hauterivian locality near the Tyndall Glacier inside Torres del Paine National Park in southern Chile yields important new data regarding ichthyosaurian diversity along the Pacific margin of Gondwana. These new data will contribute to clarifying questions regarding ichthyosaur taxonomy and the palaeobiogeographical relationships between the southern Gondwanan and Northern Hemisphere ichthyosaur groups during the Early Cretaceous. Here, we describe three new ichthyosaur specimens from this locality. Two of them are referred to Myobradypterygius hauthali, expanding the distribution of this species from the Barremian of Argentina to the Hauterivian of the Chilean Patagonia. This material shows that M. hauthali differs from Platypterygius platydactylus in forefin construction and scapular morphology, supporting its classification as a separate genus within Platypterygiinae. The third specimen is a large-bodied indeterminate ophthalmosaurine ichthyosaur. This record represents the southernmost record of Ophthalmosaurinae and the first occurrence of this group from the Cretaceous of the Southern Hemisphere. These discoveries show that ophthalmosaurines and platypterygiines continued to occur sympatrically in southernmost Gondwana during the Early Cretaceous, expanding the pattern documented in Europe to the Pacific region.
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来源期刊
CiteScore
6.50
自引率
10.70%
发文量
116
审稿时长
6-12 weeks
期刊介绍: The Zoological Journal of the Linnean Society publishes papers on systematic and evolutionary zoology and comparative, functional and other studies where relevant to these areas. Studies of extinct as well as living animals are included. Reviews are also published; these may be invited by the Editorial Board, but uninvited reviews may also be considered. The Zoological Journal also has a wide circulation amongst zoologists and although narrowly specialized papers are not excluded, potential authors should bear that readership in mind.
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