A new sauropod dinosaur from the Lower Cretaceous Ilek Formation, Western Siberia, Russia

被引：16
|
作者：
Averianov, Alexander [1 ,2 ,3 ]
Ivantsov, Stepan [2 ]
Skutschas, Pavel [2 ,4 ]
Faingertz, Alexey [2 ]
Leshchinskiy, Sergey [2 ]
机构：
[1] Russian Acad Sci, Zool Inst, Univ Skaya Nab 1, St Petersburg 199034, Russia
[2] Tomsk State Univ, Lab Mesozo & Cenozo Continental Ecosyst, Prospekt Lenina 36, Tomsk 634050, Russia
[3] Kazan Fed Univ, Inst Geol & Petr Technol, Kremlevskaya Str 4-5, Kazan 420008, Russia
[4] St Petersburg State Univ, Vertebrate Zool Dept, Univ Skaya Nab 7-9, St Petersburg 199034, Russia
来源：
GEOBIOS | 2018年 / 51卷 / 01期
关键词：
Sibirotitan astrosacralis nov gen. nov sp; Titanosauriformes; Sauropoda; Phylogenetic parsimony analysis; Early Cretaceous; Siberia; Asia; PHYLOGENETIC-RELATIONSHIPS; TITANOSAURIFORM SAUROPOD; TASTAVINSAURUS-SANZI; EARLY EVOLUTION; SP NOV; GEN; OSTEOLOGY; SPECIMEN; MAMMALS; REASSESSMENT;
D O I：
10.1016/j.geobios.2017.12.004
中图分类号：
Q91 [古生物学];
学科分类号：
0709 ; 070903 ;
摘要：
Sibirotitan astrosacralis nov. gen., nov. sp., is described based on isolated but possibly associated cervical and dorsal vertebrae, sacrum, and previously published pedal elements from the Lower Cretaceous (Barremian?) Ilek Formation at Shestakovo 1 locality (Kemerovo Province, Western Siberia, Russia). Some isolated sauropod teeth from the Shestakovo 1 locality are referred to the same taxon. The phylogenetic parsimony analyses place Sibirotitan astrosacralis nov. gen., nov. sp., as a non-titanosaurian somphospondyl titanosauriform. The new taxon exhibits four titanosauriform and one somphospondylan synapomorphies, and one autapomorphy - a hyposphene ridge that extends between the neural canal and the postzygapophyses. It differs from all other Somphospondyli by having only five sacral vertebrae. The new taxon shares with Euhelopus and Epachtosaurus sacral ribs that converge towards the middle of the sacrum in dorsal view. Sibirotitan astrosacralis nov. gen., nov. sp., is only the second sauropod taxon from Russia and one of the oldest titanosauriform described so far in Asia. (C) 2017 Elsevier Masson SAS. All rights reserved.
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页码：1 / 14
页数：14
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