A new basal coelurosaur (Dinosauria: Theropoda) from the Middle Jurassic of Siberia

Averianov, A. O.; Krasnolutskii, Sergei; Ivantsov, S. V.

doi:10.31610/trudyzin/2010.314.1.42

Cited by 29 publications

(12 citation statements)

References 25 publications

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“…Accordingly, this part of the maxilla probably contributed to the ventral part of the external naris. This contrasts with the more typical tyrannosauroid condition (present even in those with an enlarged external naris) where a long, slender maxillary process on the premaxilla contacts the premaxillary process of the nasal ( Brochu, 2003 ; Xu et al, 2006 ; Ji, Ji & Zhang, 2009 ; Rauhut, Milner & Moore-Fay, 2010 ; Averianov, Krasnolutskii & Ivantsov, 2010 ). A small notch 26 mm dorsal to the lateral alveolar margin marks the position of the subnarial foramen.…”

Section: Methodsmentioning

confidence: 86%

“…The overall impression is of a short, truncated preantorbital ramus. A furrow on the anteromedial part of the maxilla probably received the maxillary process of the premaxilla like that present in Kileskus , Guanlong and Proceratosaurus ( Xu et al, 2006 ; Averianov, Krasnolutskii & Ivantsov, 2010 ; Rauhut, Milner & Moore-Fay, 2010 ) while a slot dorsal to this furrow may have received the premaxillary process of the nasal. The part of the maxilla between these facets is dorsally convex and does not appear to have been overlapped by any bony process.…”

Section: Methodsmentioning

confidence: 92%

“…Interdental plates are typically not fused in tyrannosauroids ( e.g. , Currie, 2003 ; Hurum & Sabath, 2003 ; Averianov, Krasnolutskii & Ivantsov, 2010 ; Rauhut, Milner & Moore-Fay, 2010 ; Brusatte et al, 2010b ; Brusatte, Carr & Norell, 2012 ), though Tanycolagreus appears to be an exception ( Carpenter, Miles & Cloward, 2005 ).…”

Section: Methodsmentioning

confidence: 99%

“…32 – 34 ), and a huge amount of new information on the morphology and diversity of tyrannosauroids in general has become available since Hutt et al (2001) was published ( e.g . Xu et al, 2004 , 2006 ; Carr, Williamson & Schwimmer, 2005 ; Benson, 2008 ; Averianov, Krasnolutskii & Ivantsov, 2010 ; Li et al, 2009 ; Brusatte et al, 2010b , 2016 ; Nesbitt et al, 2019 ; Zanno et al, 2019 ). Accordingly, the above diagnosis can now be replaced.…”

Section: Methodsmentioning

confidence: 99%

“…E. lengi validated this prediction, and recent finds show that it is only one of several non-tyrannosaurid members of the coelurosaurian clade Tyrannosauroidea, some of which are as old as Middle Jurassic. Since E. lengi was named in 2001, Aviatyrannis jurassica from the Kimmeridgian Alcobaça Formation of Portugal ( Rauhut, 2003a ), Dilong paradoxus from the Lower Cretaceous Yixian Formation of China ( Xu et al, 2004 ), Guanlong wucaii from the Oxfordian Shishugou Formation of China ( Xu et al, 2006 ), Sinotyrannus kazuoensis from the Albian Jiufotang Formation of China ( Ji, Ji & Zhang, 2009 ), Kileskus aristocus from the Bathonian Itat Formation of western Siberia, Russia ( Averianov, Krasnolutskii & Ivantsov, 2010 ), Timurlengia euotica from the Turonian Bissekty Formation of Uzbekistan ( Brusatte et al, 2016 ), Moros intrepidus from the Cenomanian Cedar Mountain Formation of the USA ( Zanno et al, 2019 ) and Suskityrannus hazelae from the Turonian Moreno Hill Formation of the USA ( Nesbitt et al, 2019 ) have been published as additional non-tyrannosaurid tyrannosauroids. It has also become better established that the Late Jurassic Stokesosaurus , originally named for the Morrison Formation species S. clevelandi from the USA, originally suggested to be an early tyrannosaurid ( Madsen, 1974 ), is also an early-diverging tyrannosauroid.…”

Section: Introductionmentioning

confidence: 99%

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The osteology and affinities of Eotyrannus lengi, a tyrannosauroid theropod from the Wealden Supergroup of southern England

Naish

Cau²

2022

PeerJ

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Eotyrannus lengi Hutt et al., 2001 from the Lower Cretaceous Wessex Formation (part of the Wealden Supergroup) of the Isle of Wight, southern England, is described in detail, compared with other theropods, and evaluated in a new phylogenetic analysis. Eotyrannus is represented by a single individual that would have been c. 4.5 m long; it preserves the anterior part of the skull, a partial forelimb and pectoral girdle, various cervical, dorsal and caudal vertebrae, rib fragments, part of the ilium, and hindlimb elements excluding the femur. Lack of fusion with regard to both neurocentral and sacral sutures indicates subadult status. Eotyrannus possesses thickened, fused, pneumatic nasals with deep lateral recesses, elongate, tridactyl forelimbs and a tyrannosaurid-like scapulocoracoid. The short preantorbital ramus of the maxilla and nasals that are approximately seven times longer than they are wide show that Eotyrannus was not longirostrine. A posterodorsally inclined ridge on the ilium’s lateral surface fails to reach the dorsal margin: a configuration seen elsewhere in Juratyrant. Eotyrannus is not arctometatarsalian. Autapomorphies include the presence of curving furrows on the dentary, a block-like humeral entepicondyle, and a distoproximally aligned channel close to the distolateral border of the tibia. Within Tyrannosauroidea, E. lengi is phylogenetically intermediate between Proceratosauridae and Yutyrannus and the clade that includes Xiongguanlong, Megaraptora, Dryptosaurus and Tyrannosauridae. We do not find support for a close affinity between Eotyrannus and Juratyrant. Our analysis supports the inclusion of Megaraptora within Tyrannosauroidea and thus increases Cretaceous tyrannosauroid diversity and disparity. A proposal that Eotyrannus might belong within Megaraptora, however, is based on character states not present in the taxon. Several theropods from the Wessex Formation are based on material that overlaps with the E. lengi holotype but none can be shown to be synonymous with it.

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