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A Ceratopsian dinosaur Psittacosaurus sibiricus from the Early Cretaceous of West Siberia, Russia and its phylogenetic relationships

Published on Jan 1, 2006in Journal of Systematic Palaeontology2.315
· DOI :10.1017/S1477201906001933
Alexander O. Averianov25
Estimated H-index: 25
(RAS: Russian Academy of Sciences),
Alexei V. Voronkevich3
Estimated H-index: 3
(Tomsk State University)
+ 1 AuthorsAlexei V. Fayngertz1
Estimated H-index: 1
(Tomsk State University)
Abstract
Synopsis Psittacosaurus sibiricus from the Aptian‐Albian Ilek Formation at Shestakovo, Kemerovo Province, West Siberia, is represented by two almost complete adult skeletons, several associated groups of bones and numerous isolated bones of individuals ranging from post‐hatchling to fully grown animals. Psittacosaurus sibiricus differs from nine other species of the genus by a unique combination of 32 diagnostic characters, six of which are autapomorphies of the species: small in‐fratemporal fenestra, anteroposteriorly short premaxilla, short medial process of postorbital, deep cleft for qaudratojugal on jugal, extending to the posterior side of jugal horn, angular with prominent tuber and 23 presacrals. Psittacosaurus sibiricus is the sister species of P. sinensis, with which it shares the prominent pyramidal laterally projecting jugal horn, but more derived than the latter in having more developed palpebral and postorbital horns. The three lateral foramina on the exoc‐cipital/opisthotic are interpreted ...
  • References (35)
  • Citations (52)
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References35
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#1Alexander O. Averianov (RAS: Russian Academy of Sciences)H-Index: 25
#2Alexei Starkov (RAS: Russian Academy of Sciences)H-Index: 2
Last. Pavel P. Skutschas (RAS: Russian Academy of Sciences)H-Index: 14
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#1S. V. Leshchinsky (Tomsk State University)H-Index: 1
#2Alexander O. Averianov (RAS: Russian Academy of Sciences)H-Index: 25
Last. A. S. Rezvyi (SPbU: Saint Petersburg State University)H-Index: 1
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#1Gerald MayrH-Index: 35
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A specimen of the horned dinosaur Psittacosaurus from the early Cretaceous of China is described in which the integument is extraordinarily well-preserved. Most unusual is the presence of long bristle-like structures on the proximal part of tail. We interpret these structures as cylindrical and possibly tubular epidermal structures that were anchored deeply in the skin. They might have been used in display behavior and especially if one assumes that they were colored, they may have had a signal ...
81 CitationsSource
We describe a reasonably complete sauropod foot from the Early Cretaceous (Aptian–Albian) Ilek Formation at the Shestakovo locality in Western Siberia, Russia. It shows some primitive characters, such as slender metatarsals, a relatively long second pedal ungual, and three claws. In the likely presence of the laterodistal process on the first metatarsal the Shestakovo sauropod is similar with diplodocoids, but its more elongated and gracile first metatarsal resembles brachio− saurids (Brachiosau...
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#1Eric Buffetaut (CNRS: Centre national de la recherche scientifique)H-Index: 39
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#1Gregory M. Erickson (University of California, Berkeley)H-Index: 33
#2Tatyana A. Tumanova (RAS: Russian Academy of Sciences)H-Index: 2
Abstract The skeleton undergoes substantial histological modification during ontogeny in association with longitudinal growth, shape changes, reproductive activity, and fatigue repair. This variation can hinder attempts to reconstruct life history attributes for individuals, particularly when only fossil materials are availble for study. Histological examinations of multiple elements throughout development provide a means to control for such variability and facilitate accurate life history asses...
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#1Paul Penkalski (UPenn: University of Pennsylvania)H-Index: 1
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26 CitationsSource
#1J.F. Hicks (AMNH: American Museum of Natural History)H-Index: 2
#2D.L. Brinkman (Yale University)H-Index: 1
Last. M. WatabeH-Index: 1
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Abstract Cretaceous terrestrial sediments deposited in a series of intracratonic basins across the Gobi Desert region of southern Mongolia and northern China contain a unique and diverse vertebrate fauna. In 1996 an expedition jointly sponsored by the Mongolian Paleontological Center and the Hayashibara Museum of Natural Sciences revisited a number of famous vertebrate fossil localities in the eastern Gobi region of Mongolia and, as part of a broad geological and paleontological study, collected...
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Cited By52
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Source
#1Walter Scott Persons (U of A: University of Alberta)H-Index: 2
#2Philip J. Currie (U of A: University of Alberta)H-Index: 53
: The femoral fourth trochanter is the attachment site of the caudofemoralis musculature, which is the primary hindlimb retractor in most non-avian dinosaurs. Early ornithischian dinosaurs are uniquely characterized by a fourth trochanter with a prominent pendant process. Throughout the evolution of ornithischians, the fourth trochanter repeatedly converged on two major morphological changes: (1) the distal migration of the trochanter down the femoral shaft and (2) the loss of the pendant proces...
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#1Alexander O. Averianov (Kazan: Kazan Federal University)H-Index: 25
#2Stepan Ivantsov (Tomsk State University)H-Index: 5
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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 bear...
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#1Claire M Bullar (UoB: University of Bristol)H-Index: 1
#2Qi ZhaoH-Index: 14
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: Ontogenetic sequences are relatively rare among dinosaurs, with Ceratopsia being one of the better represented clades, and especially among geologically earlier forms, such as Psittacosaurus. Psittacosaurus is a small, bipedal basal ceratopsian abundant in the Lower Cretaceous deposits of Asia, whose cranial and endocranial morphology has been well studied, but only cursory details have been published on the bones surrounding the brain. Using reconstructions created from micro-computed tomogra...
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#1Pavel P. Skutschas (SPbU: Saint Petersburg State University)H-Index: 14
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AbstractThe Lower Cretaceous Ilek Formation in Western Siberia (Russia) has yielded various vertebrate fossils, including skeletal remains of dinosaurs. Here we report on a fragmentary theropod egg from the vertebrate locality Shestakovo 3 of the Ilek Formation in Kemerovo Province. We assign the specimen to the oogenus Prismatoolithus (oofamily Prismatoolithidae) as Prismatoolithus ilekensis oosp. nov., on the basis of the following unique combination of characters: ovoid-shaped egg; thin eggsh...
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#1James G. Napoli (AMNH: American Museum of Natural History)
#2Tyler Hunt (FSU: Florida State University)
Last. Mark A. Norell (AMNH: American Museum of Natural History)H-Index: 62
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#1Justyna Słowiak (PAN: Polish Academy of Sciences)H-Index: 1
#2Victor S. Tereshchenko (RAS: Russian Academy of Sciences)
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#1Alexander O. Averianov (RAS: Russian Academy of Sciences)H-Index: 25
#2Stepan Ivantsov (Tomsk State University)H-Index: 5
Last. Pavel P. Skutschas (SPbU: Saint Petersburg State University)H-Index: 14
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#1Eric M. Morschhauser (IUP: Indiana University of Pennsylvania)H-Index: 3
#2Hai-Lu You (CAS: Chinese Academy of Sciences)H-Index: 23
Last. Peter Dodson (UPenn: University of Pennsylvania)H-Index: 14
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AbstractThe species Auroraceratops rugosus was originally described based upon a single skull. With the recovery of over 80 individuals, a complete description of the postcranial skeleton is presen...
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#1A. V. Podlesnov (RAS: Russian Academy of Sciences)H-Index: 1
The joint of the occipital skull region and two first cervical vertebrae of Psittacosaurus sibiricus from the Shestakovo locality (Barremian–Aptian), Kemerovo Region, Russia is described. The morphological differences in the atlas–axis complex between the infraorders Psittacosauria and Neoceratopsia connected with their functional features are revealed. The atlas–axis complex of P. sibiricus consists of two unfused vertebrae. The atlas includes the centrum, neural arch, and intercentrum. The axi...
Source