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

Averianov, A. O.; Ivantsov, S. V.; Skutschas, Pavel P.; Faingertz, Alexey; Leshchinskiy, Sergey V.

doi:10.1016/j.geobios.2017.12.004

Cited by 27 publications

(20 citation statements)

References 62 publications

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“…The articulated metatarsus measures approximately 450 mm in mediolateral dimension across its proximal extreme. In contrast to most other titanosauriforms (e.g., Aeolosaurus 25 , Epachthosaurus 22 , Gobititan 26 , Ligabuesaurus 27 , Rapetosaurus 13 , the La Invernada titanosaur 24 , New Mexico Museum of Natural History [NMMNH] P-49967 [a nearly complete distal hind limb tentatively referred to Alamosaurus 28 ], and an unnamed Early Cretaceous titanosauriform from Siberia, Russia [Paleontological Museum, Tomsk State University (PM TGU) 16/0 29 ]), metatarsals III and IV are not substantially longer than the others ( Table 2 ; Supplementary Table S3 ). Indeed, in all other titanosauriforms for which the lengths of metatarsals I and III have been published, metatarsal III is at least 27 percent longer than metatarsal I; typically, it is approximately 40 percent longer ( Table 2 ).…”

Section: Resultsmentioning

confidence: 99%

A gigantic new dinosaur from Argentina and the evolution of the sauropod hind foot

Riga

Lamanna

David

et al. 2016

Sci Rep

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Titanosauria is an exceptionally diverse, globally-distributed clade of sauropod dinosaurs that includes the largest known land animals. Knowledge of titanosaurian pedal structure is critical to understanding the stance and locomotion of these enormous herbivores and, by extension, gigantic terrestrial vertebrates as a whole. However, completely preserved pedes are extremely rare among Titanosauria, especially as regards the truly giant members of the group. Here we describe Notocolossus gonzalezparejasi gen. et sp. nov. from the Upper Cretaceous of Mendoza Province, Argentina. With a powerfully-constructed humerus 1.76 m in length, Notocolossus is one of the largest known dinosaurs. Furthermore, the complete pes of the new taxon exhibits a strikingly compact, homogeneous metatarsus—seemingly adapted for bearing extraordinary weight—and truncated unguals, morphologies that are otherwise unknown in Sauropoda. The pes underwent a near-progressive reduction in the number of phalanges along the line to derived titanosaurs, eventually resulting in the reduced hind foot of these sauropods.

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Section: Resultsmentioning

confidence: 99%

A gigantic new dinosaur from Argentina and the evolution of the sauropod hind foot

Riga

Lamanna

David

et al. 2016

Sci Rep

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“…Titanosauriforms are relatively diverse and abundant in the Cretaceous of eastern Asia, at least species having been erected (D'Emic et al 2013;Mo et al, 2016;Averianov & Skutschas 2017;Averianov et al 2018). Wilson (2005) noted that all Cretaceous sauropods from eastern Asia are titanosauriforms, whereas all Jurassic sauropods from the region are non-neosauropods.…”

Section: Discussionmentioning

confidence: 99%

Peer Review #2 of "New titanosauriform (Dinosauria: Sauropoda) specimens from the Upper Cretaceous Daijiaping Formation of southern China (v0.1)"

Whitlock¹

2019

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Titanosauriform sauropod dinosaurs were once considered rare in the Upper Cretaceous of Asia, but a number of titanosauriforms from this stratigraphic interval have been discovered in China in recent years. In fact, all adequately known Cretaceous Asian sauropods are titanosauriforms, but only a few have been well studied, lending significance to any new anatomical information that can be extracted from Asia's Cretaceous sauropod record. Here we give a detailed description of some titanosauriform bones recovered recently from the Upper Cretaceous Daijiaping Formation of Tianyuan County, Zhuzhou City, Hunan Province, southern China. The occurrence of this material in Hunan increases the known geographic range of titanosauriforms in eastern Asia. Although all of the specimens discussed in this paper can be assigned to Titanosauriformes at least tentatively, some bones display a limited number of features that are more typical of basal sauropods and/or derived diplodocoids, suggesting complex patterns of character evolution within Neosauropoda.

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“…1). The time of deposition of the Ilek Formation is poorly constrained and currently estimated as Barremian-Aptian (see review in Averianov et al 2018). The Ilek Formation overlies Jurassic deposits as well as some folded heterogeneous Paleozoic and pre-Cambrian geological structures.…”

Section: Geographic and Geological Settingsmentioning

confidence: 99%

“…The Lower Cretaceous Ilek Formation, widely distributed in Western Siberia, Russia (Fig. 1), recently yielded an important vertebrate fauna, including fishes, amphibians, squamates, choristoderes, crocodyliforms, pterosaurs, various dinosaurs, birds, tritylodontids, and mammals (Maschenko and Lopatin 1998;Alifanov et al 1999;Tatarinov and Maschenko 1999;Averianov and Voronkevich 2002;Maschenko et al 2003;Averianov et al 2005Averianov et al , 2017Averianov et al , 2018Lopatin et al 2005Lopatin et al , 2009Lopatin et al , 2010aKurochkin et al 2011;O'Connor et al 2014;Skutschas 2014Skutschas , 2016Vitenko 2015, 2017;. Dinosaurs are represented by fragmentary remains of a titanosauriform sauropod Sibirotitan astrosacralis, theropods, stegosaurs, and ornithopods, as well as by several complete and well-preserved skeletons of the basal ceratopsian Psittacosaurus sibiricus from the Shestakovo 3 locality (Averianov et al 2006(Averianov et al , 2018Lopatin et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Theropod teeth from the Lower Cretaceous Ilek Formation of Western Siberia, Russia

2019

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A sample of 136 isolated theropod teeth from nine vertebrate localities within the Lower Cretaceous (Barremian-Aptian) Ilek Formation in West Siberia, Russia, can be separated into five dental morphotypes referred to five or six theropod taxa based on morphological characters. The Morphotype A includes small to large lateral teeth with relatively large distal denticles and smaller mesial denticles. Some of these teeth can be attributed to the Dromaeosauridae, while other teeth may belong to a basal member of the Tyrannosauroidea. The distinctly smaller lateral teeth referred to the Morphotype B are similar with Morphotype A in most respects but differ in the lack of mesial denticles and mesial carina, or having a lingually displaced mesial carina. These teeth may belong to juvenile individuals of the same dromaeosaurid taxon. The teeth belonging to Morphotype C also lack mesial denticles and differ from Morphotype B by a flattened area on the lingual side, which is also often present on the labial side. These teeth may belong to either Troodontidae or Microraptorinae, or to both groups. The mesial and lateral teeth of Morphotype E are characterized by unserrated mesial and distal carinae. These teeth most likely belong to a distinct taxon of Troodontidae with unserrated dentition. The teeth of the Morphotype D include mesial teeth with the mesial carina displaced lingually at various extent and denticles present on both carinae. The teeth with moderately displaced lingual carina can be referred to the same dromaeosaurid taxon, which lateral teeth represented by Morphotype A. The teeth with more displaced mesial carina and deeply U-shaped basal crown section belong to an indeterminate Tyrannosauroidea.

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

Cited by 27 publications

References 62 publications

A gigantic new dinosaur from Argentina and the evolution of the sauropod hind foot

A gigantic new dinosaur from Argentina and the evolution of the sauropod hind foot

Peer Review #2 of "New titanosauriform (Dinosauria: Sauropoda) specimens from the Upper Cretaceous Daijiaping Formation of southern China (v0.1)"

Theropod teeth from the Lower Cretaceous Ilek Formation of Western Siberia, Russia

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