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Mongolostegus (meaning "Mongolian roof") is a genus of stegosaur from the Early Cretaceous (Aptian-Albian) Dzunbain Formation of Mongolia. The type and only species is M. exspectabilis,[1] known from a single specimen previously under the nomen nudum Wuerhosaurus mongoliensis.[2]
| Mongolostegus Temporal range: Early Cretaceous, | |
|---|---|
 | |
| Skeletal reconstruction | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | †Ornithischia |
| Clade: | †Thyreophora |
| Clade: | †Stegosauria |
| Family: | †Stegosauridae |
| Genus: | †Mongolostegus Tumanova and Alifanov, 2018 |
| Type species | |
| †Mongolostegus exspectabilis Tumanova and Alifanov, 2018 | |
| Synonyms | |
| |
Mongolostegus is one of the youngest known stegosaurs, along with Stegosaurus,[3] Yanbeilong,[4] and an unnamed species from the Dzunbain Formation.[1]
The holotype is PIN 3779-15, which consists of posterior dorsal and anterior caudal vertebrae as well as pelvic material.[1] It was discovered in a layer of the Dzunbain Formation at Chamrin-Us, Mongolia.
Mongolostegus was first reported by Alifanov et al. (2005) and Alifanov (2012) as an indeterminate stegosaur.[5][6]
Ulansky (2014) informally dubbed the material Wuerhosaurus mongoliensis,[2] but Galton and Carpenter (2016) found W. mongoliensis to be invalid.[7] It was formally named as Mongolostegus by Tumanova and Alifanov in 2018.[1]
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Tumanova and Alifanov (2018) found Mongolostegus to belong to Stegosauridae.[1]
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