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Lanzhousaurus

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Lanzhousaurus
Temporal range: Lower Cretaceous, 130 Ma
Skeletal mount of Lanzhousaurus
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Clade: Ornithischia
Clade: Neornithischia
Clade: Ornithopoda
Clade: Styracosterna
Genus: Lanzhousaurus
You, Ji & Li, 2005
Type species
Lanzhousaurus magnidens
You, Ji & Li, 2005

Lanzhousaurus (meaning "Lanzhou lizard") is a genus of ornithopod dinosaur. Lanzhousaurus lived in the Gansu region of what is now China during the Early Cretaceous (Barremian). A partial skeleton has been recovered from the Hekou Group. It was described by You, Ji and Li in 2005 and the type and only species is Lanzhousaurus magnidens.[1] It's been estimated to be about 10 meters (33 feet) in length and 6 tonnes (6.6 short tons) in weight.[2]

Dentition

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Jaw and teeth of Lanzhousaurus

The genus has been described as having "astonishingly huge teeth", among the largest for any herbivorous creature ever, which indicate it was a styracosternan iguanodont. The mandible, longer than one meter, suggests a very large size for the animal. Tooth enamel of this dinosaur was growing very rapidly.[3]

Classification

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Life restoration

In their 2020 reassessment of the hadrosauromorph Orthomerus, Madzia, Jagt & Mulder ran phylogenetic analyses of Iguanodontia. In their analyses, Lanzhousaurus was recovered as a non-hadrosauriform styracosternan member of the Ankylopollexia, similar to the 2005 description by You, Ji & Li. The results of their phylogenetic analyses are shown in the cladogram below:[4][1]

Ankylopollexia

References

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  1. ^ a b You, Hailu; Ji, Qiang; Li, Daqing (2005). "Lanzhousaurus magnidens gen. et sp. nov. from Gansu Province, China: the largest-toothed herbivorous dinosaur in the world" [中国甘肃发现世界上最大牙齿的植食性恐龙:巨齿兰州龙(新属、新种)]. Geological Bulletin of China. 24 (9): 785–794. ISSN 1671-2552.
  2. ^ Paul, Gregory S. (2016). The Princeton Field Guide to Dinosaurs (2nd ed.). New Jersey: Princeton University Press. p. 319.
  3. ^ Celina A. Suarez, Hai-Lu You, Marina B. Suarez, Da-Qing Li & J. B. Trieschmann (2017). Stable Isotopes Reveal Rapid Enamel Elongation (Amelogenesis) Rates for the Early Cretaceous Iguanodontian Dinosaur Lanzhousaurus magnidens. Scientific Reports 7, Article number: 15319 (2017). doi:10.1038/s41598-017-15653-6
  4. ^ Madzia, Daniel; Jagt, John W. M.; Mulder, Eric W. A. (2020-04-01). "Osteology, phylogenetic affinities and taxonomic status of the enigmatic late Maastrichtian ornithopod taxon Orthomerus dolloi (Dinosauria, Ornithischia)". Cretaceous Research. 108: 104334. Bibcode:2020CrRes.10804334M. doi:10.1016/j.cretres.2019.104334. ISSN 0195-6671.