New interpretation of dentition in Early Cretaceous docodontan Sibirotherium based on micro-computed tomography

Averianov, Alexander O.; Lopatin, Alexey V.; Leshchinskiy, Sergey V.

doi:10.1007/s10914-023-09682-4

Cited by 5 publications

(2 citation statements)

References 23 publications

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“…This diverse assemblage includes, among other groups, stem karaurid salamanders, crown salamander Kiyatriton , basal choristoderes, tritylodontid synapsid Stereognathus , stegosaurs, docodontans and euharamyidans. All these taxa, even the genera Kiyatriton and Stereognathus , are found also in the 50 Myr younger Aptian Ilek Formation distributed in the same area, Krasnoyarsk krai and Kemerovo oblast [8–10,65,66]. Among the novel taxa of the Ilek Formation there are some typical Early Cretaceous groups such as dsungaripterid pterosaurs [67], titanosaurian sauropods [68,69] and basal ceratopsian Psittacosaurus [6,7].…”

Section: Resultsmentioning

confidence: 99%

“…This taxon is about 40 Myr younger than the previous youngest record of ceratosaurs in Asia [5]. The new noasaurid was part of an unusual vertebrate assemblage, dominated by an advanced ceratopsian dinosaur Psittacosaurus sibiricus [6,7], but also containing groups of tetrapods that have long since gone extinct in other regions, like stem salamanders, protosuchian and shartegosuchid crocodyliforms, tritylodontid synapsids and docodontan mammaliaforms [8–10].…”

Section: Introductionmentioning

confidence: 99%

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The last ceratosaur of Asia: a new noasaurid from the Early Cretaceous Great Siberian Refugium

Averianov,

Skutschas,

Atuchin

et al. 2024

Proc. R. Soc. B.

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The noasaurid ceratosaur Kiyacursor longipes gen. et sp. nov. is described based on a fragmentary skeleton including cervical vertebra, pectoral girdle, humerus and hind limbs from the Lower Cretaceous (Aptian) Ilek Formation at Shestakovo 1 locality in Western Siberia, Russia. This is the first ceratosaur from the Early Cretaceous of Asia, extending the stratigraphic range of Ceratosauria by 40 Myr on that continent. Kiyacursor shares unique hind limb proportions with Elaphrosaurus and Limusaurus , suggesting improved cursorial ability. These taxa show an ostrich-like specialization of the pes, with a large third metatarsal and greatly reduced second metatarsal. By contrast, all other fast running non-avian theropod dinosaurs have an arctometatarsalian pes, with the third metatarsal strongly reduced proximally. The new taxon lived in the Early Cretaceous ecosystem containing a number of other Jurassic relics, such as stem salamanders, protosuchian and shartegosuchid crocodyliforms, tritylodontid synapsids and docodontan mammaliaforms.

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