Jinzhousaurus

Jinzhousaurus is a genus of hadrosauroid dinosaur of the Early Cretaceous of China. The type species is Jinzhousaurus yangi. The generic name refers to the town Jinzhou. The specific name honours Yang Zhongjian as the founder of Chinese paleontology. It was first described by Wang Xiao-lin and Xu Xing in 2001.[1]

Jinzhousaurus
Temporal range: Early Cretaceous, 122 Ma
Jinzhousaurus yangi
Jinzhousaurus yangi fossil displayed in Hong Kong Science Museum.
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: Ornithischia
Suborder: Ornithopoda
Superfamily: Hadrosauroidea
Genus: Jinzhousaurus
Wang & Xu, 2001
Type species
Jinzhousaurus yangi
Wang & Xu, 2001

Discovery

Jinzhousaurus
Skull of the holotype

Its fossil, holotype IVPP V12691, was found near Baicaigou in Yixian County in the Dawangzhangzi Beds of the Yixian Formation in Liaoning, China, having an oldest determinable age of 122 million years, during the early Aptian stage of the early Cretaceous Period.[2] It consists of a nearly complete skeleton, compressed on a slab.

Description

Jinzhousaurus has a length of about 7 metres (23 ft) and its skull is about half a metre long. Its snout was elongated with large nares and lacking an antorbital fenestra. The back of the skull was uncommonly wide with a small crest on top. The dentary of the lower jaw has at least seventeen tooth positions.

Classification

Jinzhousaurus shows a mix of basal and derived features. Originally assigned to (an already understood to be paraphyletic) Iguanodontidae, later authors have referred it to the more general Iguanodontoidea. In 2010 a study concluded it was within this group a basal member of the, more derived, Hadrosauroidea.[3]

References

  1. ^ Wang, X.-L. & Xu, X. (2001) "A new iguanodontid (Jinzhousaurus yangi gen. et sp. nov.) from the Yixian Formation of western Liaoning, China." Chin. Sci. Bull., 46: 1669–1672.
  2. ^ Zhou, Z. (2006). "Evolutionary radiation of the Jehol Biota: chronological and ecological perspectives." Geological Journal, 41: 377-393.
  3. ^ A.T. McDonald, D. G. Wolfe, and J. I. Kirkland, 2010, "A new basal hadrosauroid (Dinosauria: Ornithopoda) from the Turonian of New Mexico", Journal of Vertebrate Paleontology 30(3): 799-812

External links

Ankylopollexia

Ankylopollexia is an extinct clade of ornithischian dinosaurs that lived from the Late Jurassic to the Late Cretaceous. It is a derived clade of iguanodontian ornithopods and contains the subgroup Styracosterna.

The name stems from the Greek word, “ankylos”, mistakenly taken to mean stiff, fused (in fact the adjective means bent or curved; used of fingers, it can mean hooked), and the Latin word, “pollex”, meaning thumb. Originally described in 1986 by Sereno, this most likely synapomorphic feature of a conical thumb spine defines the clade.First appearing around 156 million years ago, in the Jurassic, Ankylopollexia became an extremely successful and widespread clade during the Cretaceous, and were found around the world. The group died out at the end of the Maastrichtian. Even though they grew to be quite large, comparable to some carnivorous dinosaurs, they were universally herbivorous. Most ankylopollexians were bipedal.

Aralosaurini

Aralosaurini is a tribe of basal lambeosaurine hadrosaurs endemic to Eurasia. It currently contains Aralosaurus (from the Aral sea of Kazakhstan) and Canardia (from Toulouse, Southern France).

Canardia

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Elasmaria

Elasmaria is a clade of iguanodont ornithopods known from Cretaceous deposits in South America, Antarctica, and Australia.

Hadrosauroidea

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Huehuecanauhtlus

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Iguanodontia

Iguanodontia (the iguanodonts) is a clade of herbivorous dinosaurs that lived from the Middle Jurassic to Late Cretaceous. Some members include Camptosaurus, Dryosaurus, Iguanodon, Tenontosaurus, and the hadrosaurids or "duck-billed dinosaurs". Iguanodontians were one of the first groups of dinosaurs to be found. They are among the best known of the dinosaurs, and were among the most diverse and widespread herbivorous dinosaur groups of the Cretaceous period.

Iguanodontidae

Iguanodontidae is a family of iguanodontians belonging to Styracosterna, a derived clade within Ankylopollexia.

Characterized by their elongated maxillae, they were herbivorous and typically large in size. This family exhibited locomotive dynamism; there exists evidence for both bipedalism and quadrupedalism within iguanodontid species, supporting the idea that individual organisms were capable of both locomoting exclusively with their hind limbs and locomoting quadrupedally. Iguanodontids possess hoof-like second, third, and fourth digits, and in some cases, a specialized thumb spike and an opposable fifth digit. Their skull construction allows for a strong chewing mechanism called a transverse power stroke. This, paired with their bilateral dental occlusion, made them extremely effective as herbivores. Members of Iguanodontidae are thought to have had a diet that consisted of both gymnosperms and angiosperms, the latter of which co-evolved with the iguanodontids in the Cretaceous period.There is no consensus on the phylogeny of the group. Iguanodontidae is most frequently characterized as paraphyletic with respect to Hadrosauridae, although some researchers advocate for a monophyletic view of the family.

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Laiyangosaurus

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Lapampasaurus

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Osmakasaurus

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Proa valdearinnoensis

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Sahaliyania

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Tsintaosaurini

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