Caudal vertebrae of titanosaurian sauropod dinosaurs from the Lower Cretaceous Ilek Formation in Western Siberia, Russia A. O. Averianov, S. V. Ivantsov, P. P. Skutschas
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ArticleContent type: Текст Media type: электронный Subject(s): завроподы | Западная Сибирь | нижнемеловая илекская свита | хвостовые позвонки | титанозаврыGenre/Form: статьи в журналах Online resources: Click here to access online
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Cretaceous research Vol. 107. P. 104309 (1-9)Abstract: Three sauropod middle caudal vertebrae are described from the three different localities within the
Lower Cretaceous (Barremian-Aptian) Ilek Formation in Krasnoyarsk Territory, Western Siberia, Russia.
All vertebrae are strongly procoelous and can be referred to Lithostrotia indet. LMCCE 005/40 from
Bol'shoi Kemchug 3 locality has a ventral groove on centrum and a very large neural spine that projects
posteriorly far beyond the centrum. This specimen also lacks postzygapophyses and bears a heavily
sculptured neural spine suggesting high degree of development of the interosseous ligaments. The
structure of the neural spine LMCCE 005/40 is similar to that of the saltasaurine Neuquensaurus from the
Late Cretaceous of South America. However, the Siberian specimen lacks camellate bone texture characteristic
for the caudal vertebrae of Saltasaurinae and its similarity with Neuquensaurus in development
of the neural spine likely was independently acquired. These new findings increase the known diversity
of sauropod dinosaurs in the Early Cretaceous of Siberia, which includes three taxa of Lithostrotia indet.
described herein, lithostrotian Tengrisaurus, and titanosauriform Sibirotitan.
Библиогр.: с. 104309 (8-9)
Three sauropod middle caudal vertebrae are described from the three different localities within the
Lower Cretaceous (Barremian-Aptian) Ilek Formation in Krasnoyarsk Territory, Western Siberia, Russia.
All vertebrae are strongly procoelous and can be referred to Lithostrotia indet. LMCCE 005/40 from
Bol'shoi Kemchug 3 locality has a ventral groove on centrum and a very large neural spine that projects
posteriorly far beyond the centrum. This specimen also lacks postzygapophyses and bears a heavily
sculptured neural spine suggesting high degree of development of the interosseous ligaments. The
structure of the neural spine LMCCE 005/40 is similar to that of the saltasaurine Neuquensaurus from the
Late Cretaceous of South America. However, the Siberian specimen lacks camellate bone texture characteristic
for the caudal vertebrae of Saltasaurinae and its similarity with Neuquensaurus in development
of the neural spine likely was independently acquired. These new findings increase the known diversity
of sauropod dinosaurs in the Early Cretaceous of Siberia, which includes three taxa of Lithostrotia indet.
described herein, lithostrotian Tengrisaurus, and titanosauriform Sibirotitan.
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