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首页> 外文期刊>Journal of Systematic Palaeontology >THE SIGNIFICANCE OF SUUWASSEA EMILIEAE (DINOSAURIA: SAUROPODA) FOR FLAGELLICAUDATAN INTRARELATIONSHIPS AND EVOLUTION
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THE SIGNIFICANCE OF SUUWASSEA EMILIEAE (DINOSAURIA: SAUROPODA) FOR FLAGELLICAUDATAN INTRARELATIONSHIPS AND EVOLUTION

机译：短吻鳄（SUSUWASSEA EMILIEAE（DINOSAURIA：SAUROPODA））对于紫花金丝石的内部关系和进化的意义

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摘要

Suuwassea emilieae is a recently described dinosaur taxon discovered in the Upper Jurassic Morrison Formation of the western United States and the only non-diplodocid flagellicaudatan (Dinosauria: Sauropoda) known from North America. It retains sauropod symplesiomorphies that are unexpected in a Late Jurassic taxon and thus sheds light on the evolutionary origins of the Flagelli-caudata. Despite being comparatively small, the holotype of Suuwassea demonstrates hallmarks of relatively advanced age. A phylogenetic analysis of 30 taxa and 331 characters retains Suuwassea in a trichotomy with the Diplodocidae (Apatosaurus + (Diplodocus + Barosaurus)) and the Dicraeo-sauridae (Dicmeosaurus + Amargasaurus). This lack of resolution is probably due to a combination of missing data, character conflict and poor incorporation of specimens referred to diplodocid taxa that differ from their holotype specimens and species holotypes. Middle Jurassic palaeobiogeographical reconstructions conflict with the hypothetical distribution of flagellicaudatans in the Middle and Late Jurassic based on their phylogeny, implying that physical barriers, such as epeiric seas, were not responsible for limiting their initial radiation. The postparietal foramen shared by Suuwassea, Dicraeosaurus, Tornieria and Amargasaurus may correlate to preferred existence in near-shore, terrestrial environments.
机译：Suuwassea emilieae是最近在美国西部的上侏罗纪莫里森地层中发现的一种恐龙分类群，也是北美唯一已知的非双齿鞭毛龙（Dinosauria：Sauropoda）。它保留了侏罗纪晚期分类群中出乎意料的蜥脚类动物的同形体，从而阐明了弗拉格里-茎叶龙的进化起源。尽管相形见small，但Suuwassea的原型显示出年龄相对较高的特征。对30个分类单元和331个字符进行系统发育分析，将Suuwassea与Diplodocidae（Apatosaurus +（Diplodocus + Barosaurus））和Dicraeo-sauridae（Dicmeosaurus + Amargasaurus）进行了三角切分。这种缺乏分辨率的原因可能是由于缺少数据，字符冲突以及被称为双足类群的标本与标本标本和物种标本不同而导致的。中侏罗纪古生物地理重建与中，晚侏罗纪鞭毛龙的假设分布相冲突，这是基于它们的系统发育，这意味着诸如大洋的物理障碍并不构成限制其初始辐射的原因。 Suuwassea，Dicraeosaurus，Torneria和Amargasaurus共享的壁后孔可能与近岸陆地环境中的优选生存有关。

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