TY - JOUR

T1 - A new sauropod dinosaur from the Lower Cretaceous Ilek Formation, Western Siberia, Russia

AU - Averianov, Alexander

AU - Ivantsov, Stepan

AU - Skutschas, Pavel

AU - Faingertz, Alexey

AU - Leshchinskiy, Sergey

N1 - Funding Information: We thank Elizaveta Boitsova (Saint Petersburg State University, Russia) for making photos of the specimens. We are grateful to Drs. Federico Fanti and Claire Peyre de Fabrègues, as well as to one anonymous reviewer, for reading the manuscript and useful suggestions. This work was conducted within the state task of the Ministry of Education and Science of the Russian Federation, Project 5.4217.2017/4.6; it was performed according to the Russian Government Program of Competitive Growth of Kazan Federal University. Publisher Copyright: © 2017 Elsevier Masson SAS Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2018/2

Y1 - 2018/2

N2 - 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.

AB - 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.

KW - Asia

KW - Early Cretaceous

KW - Phylogenetic parsimony analysis

KW - Sauropoda

KW - Siberia

KW - Sibirotitan astrosacralis nov. gen., nov. sp.

KW - Titanosauriformes

UR - http://www.scopus.com/inward/record.url?scp=85041704616&partnerID=8YFLogxK

UR - http://www.mendeley.com/research/new-sauropod-dinosaur-lower-cretaceous-ilek-formation-western-siberia-russia

U2 - 10.1016/j.geobios.2017.12.004

DO - 10.1016/j.geobios.2017.12.004

M3 - Article

AN - SCOPUS:85041704616

VL - 51

SP - 1

EP - 14

JO - Geobios

JF - Geobios

SN - 0016-6995

IS - 1

ER -