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首页> 外文期刊>Journal of Paleontology >Marine Early Triassic Actinopterygii from Elko County (Nevada, USA): implications for the Smithian equatorial vertebrate eclipse
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Marine Early Triassic Actinopterygii from Elko County (Nevada, USA): implications for the Smithian equatorial vertebrate eclipse

机译：来自Elko County（Unvada，USA）的海洋早期三叠系Actinopterygii：对史密斯赤道脊椎动物Eclipse的影响

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摘要

The Early Triassic vertebrate record from low paleolatitudes is spotty, which led to the notion of an "equatorial vertebrate eclipse' during the Smithian. Here we present articulated ray-finned fishes (Actinopterygii), collected from the marine Lower Triassic Thaynes Group at three new localities in Elko County (Nevada, USA), which were deposited within the equatorial zone. From the Smithian of the Winecup Ranch, we describe two partial skulls of the predatory actinopterygian Birgeria (Birgeriidae), attributed to B. americana new species and Birgeria sp. Birgeria americana n. sp. is distinguished from other species by a less reduced operculogular series. With an estimated total length of 1.72-1.85 m, it is among the largest birgeriids. We confirm that Birgeria encompasses species with either two or three rows of teeth on the maxilla and dentary, and suggest that species with three well-developed rows are restricted to the Early Triassic. From the latest Smithian of Palomino Ridge, we present a three-dimensional, partial skull of the longirostrine predator Saurichthys (Saurichthyidae). This and other occurrences indicate that saurichthyids were common in the western USA basin. From the early late Spathian of Crittenden Springs, we describe a posterior body portion (Actinopterygii indet.). This find is important given the paucity of Spathian osteichthyan sites. We provide a summary of Early Triassic vertebrate occurrences in the United States, concluding that vertebrate fossils remain largely unstudied. The presence of predatory vertebrates in subequatorial latitudes during the Smithian confirms that Early Triassic trophic chains were not shortened and contradicts the 'equatorial vertebrate eclipse'.
机译：来自低谷胱甘肽的早期三叠纪脊椎动记录是斑点，它导致了史密斯期间的“赤道脊椎动物Eclipse”的概念。在这里，我们呈现出铰接的射线鱼（Actinopterygii），在三个新的海洋下三叠层Thaynes集团收集埃尔科县（内华达州，美国）的地方被存放在赤道区内。从WineCup牧场的雄蕊中，我们描述了两个掠夺性Actinopterygian Birgeria（Birgeriidae）的部分颅骨，归因于B. Americana新物种和Birgeria sp 。Birgeria Americana N. SP。通过减少的操作系统系列与其他物种区分开来。估计总长度为1.72-1.85米，是最大的Birgeriid。我们确认Birgeria包含两排或三排的物种夹竹桃和伪心的牙齿，并表明，具有三排的种类限制在早期的三叠纪。从最新的巴洛米诺山脊上，我们是p怨恨渴望的渴望血腥捕食者SauriChthys（Saurichthyidae）的三维部分头骨。这种情况和其他事件表明Saurichthyids在美国西部盆地中很常见。从Crittenden Springs的临时临时临时，我们描述了一个后身体部分（Actinopterygii Indet。）。鉴于斯巴斯骨桥景点的缺乏态度，这一发现很重要。我们提供了美国早期三叠纪脊椎动物发生的摘要，结论是脊椎动物化石仍然在很大程度上不含糊。在史密斯期间，在亚赤道潜水中存在掠食性脊椎动物证实，早期三叠纪的营养链并没有缩短并与“赤道脊椎动物Eclipse”相矛盾。

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  • 来源
    《Journal of Paleontology》 |2017年第5期|共22页
  • 作者

    Romano Carlo; Jenks James F.; Jattiot Romain; Scheyer Torsten M.; Bylund Kevin G.; Bucher Hugo;

  • 作者单位

    Univ Zurich Paleontol Inst &

    Museum Karl Schmid Str 4 CH-8006 Zurich Switzerland;

    1134 Johnson Ridge Lane W Jordan UT 84084 USA;

    Univ Zurich Paleontol Inst &

    Museum Karl Schmid Str 4 CH-8006 Zurich Switzerland;

    Univ Zurich Paleontol Inst &

    Museum Karl Schmid Str 4 CH-8006 Zurich Switzerland;

    140 South 700 East Spanish Fork UT 84660 USA;

    Univ Zurich Paleontol Inst &

    Museum Karl Schmid Str 4 CH-8006 Zurich Switzerland;

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  • 正文语种 eng
  • 中图分类 古生物学;
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