首页> 外文期刊>Zoological Journal of the Linnean Society >Anatomy of the basal titanosaur (Dinosauria, Sauropoda) Andesaurus delgadoi from the mid-Cretaceous (Albian-early Cenomanian) Rio Limay Formation, Neuquen Province, Argentina: implications for titanosaur systematics
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Anatomy of the basal titanosaur (Dinosauria, Sauropoda) Andesaurus delgadoi from the mid-Cretaceous (Albian-early Cenomanian) Rio Limay Formation, Neuquen Province, Argentina: implications for titanosaur systematics

机译:阿根廷内乌肯省白垩纪中期(阿尔比-早新生代)里奥利马伊组基底钛恐龙(恐龙,蜥脚类恐龙)的Andesaurus delgadoi的解剖:对恐龙系统的影响

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Titanosauria is a taxonomically and morphologically diverse clade of sauropod dinosaurs that appeared in the Middle Jurassic and radiated in the mid-Late Cretaceous; however, its intrarelationships are poorly understood. The mid-Cretaceous Argentinean sauropod Andesaurus delgadoi has repeatedly been recovered at the base of Titanosauria, and thus represents a crucial taxon for determining the evolutionary history of this clade; yet it has only received a brief description. Here, we re-describe the holotype, comprising dorsal, sacral, and caudal vertebrae, as well as limb and pelvic elements. Detailed comparisons are made with a global array of titanosauriforms. Andesaurus is a valid genus and can be diagnosed by five autapomorphies: (1) posterior dorsal neural spine height greater than twice centrum height (autapomorphic within Macronaria); (2) square-shaped anterior-middle caudal centra in lateral view; (3) anteroposteriorly elongate fossa present on the anterodorsal corner of the lateral surface of middle-posterior caudal centra; (4) ridge along the midshaft of the ventral surface of metacarpal I, close to the ventromedial margin; (5) prominent ventromedial ridge along the distal half of metacarpal V. Other remains previously attributed to Andesaurus cannot be referred to this genus. Sixteen putative titanosaur synapomorphies can be recognized in Andesaurus, including: (1) lateral pneumatic foramina in dorsal vertebrae situated within fossae; (2) anterior-middle caudal vertebrae with ventrolateral ridges either side of a ventral midline hollow; and (3) lateral bowing of metacarpal I. This revision provides an important foundation for future phylogenetic analyses of titanosaurs, and adds to our growing understanding of this enigmatic clade. Lastly, we recommend the disuse of the coordinated suprageneric rank taxa of Andesaurus (Andesaurinae, Andesauridae, and Andesauroidea), at least until titanosaur intrarelationships are better elucidated
机译:Titanosauria是蜥脚类恐龙的分类学和形态学多样化进化枝,出现在侏罗纪中期,并辐射到白垩纪中期。但是,人们对它的内部关系知之甚少。白垩纪中期的阿根廷蜥脚类蜥蜴(Andesaurus delgadoi)已在泰坦巨蜥科的基部反复被发现,因此,它是确定该进化支进化史的关键分类群。但它只得到了简短的描述。在这里,我们重新描述完整型,包括背、,和尾椎以及四肢和骨盆元素。详细的比较是与全球范围内的钛恐龙形。十二指肠是有效的属,可以通过五种亚型诊断:(1)后背神经脊柱高度大于中心高度的两倍(Macronaria中的亚种); (2)侧面呈方形的前中尾中央; (3)在后中尾中央侧面外侧的前角上存在前窝。 (4)沿掌骨I腹面中轴的脊,靠近腹膜边缘; (5)沿掌骨V的远端有明显的腹侧脊。以前归因于安德龙的其他遗骸不能被称为该属。在安第斯龙中可以识别出16种假定的钛恐龙突触型,包括:(1)位于窝内的​​背椎骨的侧向气孔; (2)前中尾椎,腹侧中线两侧各有腹侧脊; (3)掌骨I的侧弯。该修订版为将来的泰坦龙的系统发育分析提供了重要的基础,并加深了我们对该神秘进化枝的认识。最后,建议至少在更好地阐明泰坦恐龙内部关系之前,建议不要使用安德龙的协同sup上类群(安德龙,安德龙和安德龙)

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