The oldest titanosaurian sauropod of the Northern Hemisphere

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The oldest titanosaurian sauropod of the Northern Hemisphere

机译：最古老的titanosaurian蜥脚类动物的北部半球

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Volgatitan simbirskiensis, gen. et sp. nov., is described based on a series of anterior and middle caudal vertebrae from a single individual discovered in the Lower Cretaceous (upper Hauterivian, Speetoniceras versicolor ammonite Zone) marine deposits at Slantsevy Rudnik vertebrate locality near Ulyanovsk City, Russia. The new taxon is characterized by strongly procoelous anterior and middle caudal vertebrae, a long centrum of the first caudal vertebra, a strong ventral ridge in the anterior and middle caudal vertebrae, a neural arch positioned at the anterior half of the centrum, hyposphene-hypantrum articulation in the anterior caudal vertebrae, and somphospondylous bone texture. Phylogenetic analysis places the new taxon as a lithostrotian titanosaur, a basal member of the lineage leading to the Lognkosauria. This lineage previously contained only South American taxa with body mass reaching 60–70 tons. Volgatitan gen. nov. is the first European and the geologically oldest representative of this lineage. Its body mass is estimated as 17.3 tons. Discovery of Volgatitan gen. nov. suggests that the lithostrotian lineage leading to the Lognkosauria had a wider distribution in the Early Cretaceous and became extinct everywhere except South America by the end of the Early Cretaceous.

机译：Volgatitan simbirskiensis,将军等sp. 11月。基于一系列前和描述从一个人中间尾椎下白垩统(上发现的欧特里夫期,Speetoniceras杂色的亚扪人区)海洋沉积物Slantsevy Rudnik脊椎动物地点附近的乌里扬诺夫斯克城,俄罗斯。新分类单元的特征是强烈procoelous尾椎的前部和中部,第一尾椎骨的椎体,强大的腹侧脊前和中间尾椎神经弓定位的前一半的中枢,在前hyposphene-hypantrum清晰度尾椎,somphospondylous骨头纹理。分类单元的雷龙lithostrotian,基底血统导致的成员Lognkosauria。只有与体重到达南美类群60 - 70吨。欧洲和地质古老这个家族的代表。估计为17.3吨。11月表明lithostrotian血统导致Lognkosauria更广泛分布在白垩纪早期除了南美的灭绝白垩纪早期。

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《Biological communications》 |2018年第3期|145-162|共18页
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中图分类普通生物学;
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Sauropoda; dinosaurs; Northern HemisphereEastern Europedescentnew taxaNeocomianGEN1 geneCoccygeal Vertebra;

机译：Sauropoda;恐龙;HemisphereEastern北部Europedescentnew taxaNeocomianGEN1 geneCoccygeal椎;

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The oldest titanosaurian sauropod of the Northern Hemisphere

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