Monkonosaurus

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Monkonosaurus
Temporal range: Late Jurassic, 163–152.1 Ma
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: †Ornithischia
Clade: †Thyreophora
Suborder: †Stegosauria
Genus: †Monkonosaurus
Zhao, 1986
Species:
†M. lawulacus
Binomial name
†Monkonosaurus lawulacus
Zhao, 1986

Monkonosaurus (meaning "Monkon lizard") is a dubious genus of herbivorous stegosaurian dinosaur from the Late Jurassic/Early Cretaceous-aged of Tibet (or the Early Cretaceous Lura Formation of China). Some sources place it as alive during the Oxfordian - Albian stages, around 163 - 100 million years ago,[1] although Monkonosaurus was probably only alive during the Kimmeridgian (157.3 – 152.1 ± 0.9 million years ago).[2]

Discovery and naming[]

The genus was formalized by Zhao Xijin in 1986.[1] The generic name refers to Markam County, also known as Monko.[3] Zhao at the time gave neither a description, meaning the name remained a nomen nudum, nor a specific name. The latter was provided in 1986 when the type species Monkonosaurus lawulacus was named, the epithet referring to the , the Lawu mountains. The first description was provided in 1990 by Dong Zhiming.[4]

The holotype, IVPP V 6975, was found in a layer of the dating probably from the Late Jurassic,[4] or from the Early Cretaceous Lura Formation.[5] It consists of a partial skeleton lacking the skull. It contains a pelvis with sacrum, two vertebrae and three back plates. The fragmentary condition of this single skeleton places doubt on the validity of this genus, with some studies concluding it is a nomen dubium.[2]

Description[]

Monkonosaurus was about 5 metres (16 ft) long when fully grown.[4] The ilium has a length of 905 millimetres. The sacrum consists of five sacral vertebrae.[4]

Classification[]

Zhao (1983) placed Monkonosaurus in the .[3] Later researchers considered it an indeterminate member of the Stegosauridae.[2]

See also[]

References[]

  1. ^ a b X. Zhao. 1986. [Reptilia]. Ching-kuo Ti Pao o Hsi [The Cretaceous System of China. The Stratigraphy of China.] 12:67-73
  2. ^ a b c Maidment, Susannah C.R.; Guangbiao Wei (2006). "A review of the Late Jurassic stegosaurs (Dinosauria, Stegosauria) from the People's Republic of China". Geological Magazine. 143 (5): 621–634. Bibcode:2006GeoM..143..621M. doi:10.1017/S0016756806002500. S2CID 83661067. Retrieved 2008-06-29.
  3. ^ a b Chao S., 1983. "Phylogeny and Evolutionary Stages of Dinosauria", Acta Palaeontologia Polonica 28 (1/2): 295-306
  4. ^ a b c d Dong, Z., 1990, "Stegosaurs of Asia", In: Carpenter, K. and Currie J. (eds.). Dinosaur Systematics. Cambridge: Cambridge University Press. pp 255-268
  5. ^ Weishampel, David B; et al. (2004). "Dinosaur distribution (Early Cretaceous, Asia)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 563-570. ISBN 0-520-24209-2.


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