A new, large tyrannosaurine theropod from the Upper Cretaceous of China

Hone, David W. E.; Wang, Kebai; Sullivan, Corwin; Zhao, Xiaolu; Chen, Shuqing; Li, Dunjin; Shu'an, JI; Ji, Qiang; Xu, Xing

doi:10.1016/j.cretres.2011.03.005

Cited by 64 publications

(40 citation statements)

References 17 publications

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“…This topology is consistent with a hypothesis of anagenesis: Z. magnus lived no less than 73.5 Ma47, and T. rex lived between 66.0 and ~67.2–67.4 Ma48. The age of the Nemegt Formation, from which T. bataar has been collected, is less than 75.0 Ma based on radiometric dating of the underlying Barun Goyot Formation49.…”

Section: Discussionsupporting

confidence: 90%

“…Dispersal of tyrannosaurines from Laramidia to Asia must have occurred in that span (99.5 to ~80.0 Ma), to account for the presence in Asia of the relatively basal Alioramus and derived Tyrannosaurus (both from the Nemegt Formation, ~75.0–66.0 Ma49), and the derived Z. magnus (Wangshi Group, 73.5+ Ma47). Also, there is no evidence for faunal exchange between the landmasses from 80 to 75.7 Ma, so the dispersal had to occur prior to this point.…”

Section: Discussionmentioning

confidence: 99%

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A new tyrannosaur with evidence for anagenesis and crocodile-like facial sensory system

Carr

Varricchio

Sedlmayr

et al. 2017

Sci Rep

106

185

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A new species of tyrannosaurid from the upper Two Medicine Formation of Montana supports the presence of a Laramidian anagenetic (ancestor-descendant) lineage of Late Cretaceous tyrannosaurids. In concert with other anagenetic lineages of dinosaurs from the same time and place, this suggests that anagenesis could have been a widespread mechanism generating species diversity amongst dinosaurs, and perhaps beyond. We studied the excellent fossil record of the tyrannosaurid to test that hypothesis. Phylogenetic analysis places this new taxon as the sister species to Daspletosaurus torosus. However, given their close phylogenetic relationship, geographic proximity, and temporal succession, where D. torosus (~76.7–75.2 Ma) precedes the younger new species (~75.1–74.4 Ma), we argue that the two forms most likely represent a single anagenetic lineage. Daspletosaurus was an important apex predator in the late Campanian dinosaur faunas of Laramidia; its absence from later units indicates it was extinct before Tyrannosaurus rex dispersed into Laramidia from Asia. In addition to its evolutionary implications, the texture of the facial bones of the new taxon, and other derived tyrannosauroids, indicates a scaly integument with high tactile sensitivity. Most significantly, the lower jaw shows evidence for neurovasculature that is also seen in birds.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

A new tyrannosaur with evidence for anagenesis and crocodile-like facial sensory system

Carr

Varricchio

Sedlmayr

et al. 2017

Sci Rep

106

185

View full text Add to dashboard Cite

show abstract

“…Alioramins coexisted across Asia with Tarbosaurus (and potentially other species of more traditional, deep-snouted tyrannosaurids 34 ), and their divergent body plans may have allowed them to partition niches. Interestingly, all known specimens of long-snouted alioramins have pronounced rugosities on the nasals, which are a synapomorphy uniting the clade.…”

Section: Sinotyrannusmentioning

confidence: 99%

A new clade of Asian Late Cretaceous long-snouted tyrannosaurids

Lü

Yi²,

Brusatte

et al. 2014

Nat Commun

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The iconic tyrannosaurids were top predators in Asia and North America during the latest Cretaceous, and most species had deep skulls that allowed them to generate extreme bite forces. Two unusual specimens of Alioramus from Mongolia seem to indicate a divergent long-snouted body plan among some derived tyrannosaurids, but the rarity and juvenile nature of these fossils leaves many questions unanswered. Here, we describe a remarkable new species of long-snouted tyrannosaurid from the Maastrichtian of southeastern China, Qianzhousaurus sinensis. Phylogenetic analysis places Qianzhousaurus with both species of Alioramus in a novel longirostrine clade, which was geographically widespread across latest Cretaceous Asia and formed an important component of terrestrial ecosystems during this time. The new specimen is approximately twice the size as both Alioramus individuals, showing that the long-snouted morphology was not a transient juvenile condition of deep-snouted species, but a characteristic of a major tyrannosaurid subgroup.

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“…The metatarsal was identified as a right metatarsal IV by Hu (1973) and Hu et al (2001) but was reinterpreted as a probable left metatarsal II by Hone et al (2011), who designated T. zhuchengensis as a nomen dubium. In the same work, Hone et al (2011) erected the new taxon Zhuchengtyrannus magnus Hone, Wang, Sullivan, Zhao, Chen, Li, Ji, Ji, and Xu, 2011 on the basis of an associated right maxilla and left dentary (ZCDM V0031) from the Xingezhuang Formation near Zhucheng.…”

Section: Introductionmentioning

confidence: 97%