Chungkingosaurus ‭(‬Chungking lizard‭)

Short Info

Chungkingosaurus ‭(‬Chungking lizard‭)

Phonetic : Chun-king-o-sore-us.

Named By : Z.‭ ‬Dong,‭ ‬S.‭ ‬Zhou,‭ ‬and H.‭ ‬Zhang‭ ‬-‭ ‬1983

Diet : Herbivore

Size : Estimated 4 meters long

Type of Dinosaur : Armoured Dinosaur

Type Species : C.‭ ‬jiangbeiensis‭ (‬type‭)

Found in : China‭ ‬-‭ ‬Sichuan Province‭ ‬-‭ ‬Dashanpu/Upper Shaximiao Formation

When it Lived : Late Jurassic, 159-142 million years ago

Chungkingosaurus which means “Chongqing Lizard”, is an herbivore dinosaur genus that was found in the Late Jurassic Upper Shaximiao Formation in the present-day China. It is a part of Stegosauria.

Chungkingosaurus jiangbeiensisI, Laikayiu, CC BY-SA 3.0, via Wikimedia Commons

Based on Dong e.a. the Chungkingosaurus Jiangbeiensis holotype is one of the slimmest stegosaurs , with the length of just four meters, even though it appeared to be an adult, judging from the sacrum’s ossification. Chungkingosaurus sp. 1 was estimated to be five metres. Chungkingosaurus sp. 2 was thought to be more than five meters. Dong e.a. revealed that Chungkingosaurus resembled Tuojiangosaurus which was found in the same formation in many anatomical aspects. Chungkingosaurus differed from Tuojiangosaurus in its small size as well as its deeper snout and lower jaws (resulting in a rather large and narrow skull) as well as non-overlapping teeth with less prominent denticles.

Chungkingosaurus likely had the two plates as well as spikes that were on the back of its head that were placed in pairs, however the exact number of plates is not known. A model of a skeleton in Chongqing Municipal Museum. Chongqing Municipal museum shows fourteen pairs of plates. This model also contains two pairs of spikes for the tail. These plates from Chungkingosaurus feature a thickened middle section, as if are modified spikes. The plates are similar to those of Tuojiangosaurus. The thagomizer’s shape and the tail-end spikes that were used as a defensive weapon, was only identified from the specimen CV 00208. It is preserved by two pairs of vertically oblique extremely stout spikes. Dong e.a. discovered that a third pair of spikes to the front of them was there, but was lost in the excavation. The most notable feature is the existence of a second pair near the tail end. It consists of thin and long spikes, arranged nearly horizontally and obliquely toward the rear and sides in the top view. Paul identified this particular Thagomizer as one of a “pin-cushion array”. The thagomizer in Tuojiangosaurus is not identified from the remains of articulated remains.

Chungkingosaurus fossils were discovered in the vicinity of Chongqing, China, from 1977 and onwards. The species of the type, Chungkingosaurus jiangbeiensis, was identified and described by Dong Zhiming, Zhou Shiwu Zhou Shiwu, Zhou Shiwu, and Zhang Yihong in 1983. The generic name is a reference to Chonqqing in Sichuan. The particular name is referring to the area of Jiangbei.

The Holotype, CV 00206, was located inside the Chunking Group of the Upper Shaximiao Formation. It’s comprised of a part of a skull, which includes the snout and the lower jaws’ front and ten vertebrae dorsal sacrum in the pelvis, a set of 23 tail vertebrae the lower portion of the humerus, three metacarpals, both thighbones as well as the shinbones, as well as the back plate, which is five.

Dong e.a. in 1983, described three more species in 1983. They were not named separately but were identified by the name of Chungkingosaurus sp. 1-3. Chungkingosaurus sp. 1 was basing itself on the specimen CV 00207 that had a sacrum with a pelvis. The second specie, Chungkingosaurus sp. 2, was based upon the specimen CV 02205, a partially Skeleton. The third specie, Chungkingosaurus sp. 3. was based off the specimen CV 00208, which is a sequence of ten vertebrae on an end of the tail that has an articulated thagomizer. In 2014, Roman Ulansky named CV 00205 Chungkingosaurus giganticus, and CV 00205 Chungkingosaurus magnus. Peter Malcolm Galton and Kenneth Carpenter have identified both as dubia nomina, referring each to C. Jiangbeiensis.

in 2006 Susannah Maidment and Wei Guangbiao deemed Chungkingosaurus as a valid genus even though a lot of the specimen could no longer be located. The specimen CV 00207 was believed by them no longer linked to Chungkingosaurus. But, Gregory S. Paul in 2010 claimed it was possible that Chungkingosaurus was the youngster of Tuojiangosaurus.

Source: Wikipedia