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Mosasaurus (/ ˌ m oʊ z ə ˈ s ɔːr ə s /; "lizard of the Meuse River") is the type genus (defining example) of the mosasaurs, an extinct group of aquatic squamate reptiles.It lived from about 82 to 66 million years ago during the Campanian and Maastrichtian stages of the Late Cretaceous.
Mosasaurus hoffmannii, the largest known species reached up to 17 m (56 ft), [3] but it has been considered to be probably overestimated by Cleary et al. (2018). [4] Currently, the largest publicly exhibited mosasaur skeleton in the world is on display at the Canadian Fossil Discovery Centre in Morden , Manitoba .
Junior synonym of Mosasaurus. Lestosaurus. Marsh. 1872. Jr. synonym. Junior synonym of Platecarpus. Liodon. Agassiz. 1846. Nomen dubium USA Germany New Zealand Angola. Dubious genus due to the fragmentary nature of the type specimen and the type species L. anceps. All species referred to it likely do not belong to the same genus. Macrosaurus ...
A new species of mosasaur — Jormungandr walhallaensis — is unusual, displaying a mix of traits from other creatures of its kind. Challenging what’s known about these ancient giants, it could ...
The taxonomic revision of the genus has yet to be formally published [c] but has been verbally referenced in Street and Caldwell (2017) [9] and in abstracts presented at meetings [68] [69] Street and Caldwell (2017) also presented a brief preliminary taxonomic review of Mosasaurus that identified five likely valid species— [d] M. hoffmannii ...
The genus contains a single species, J. walhallaensis, known from a nearly-complete skull and partial skeleton. Jormungandr was a medium-sized mosasaur, at around 6–8 metres (20–26 ft) long, and its skeletal anatomy exhibits a mix of features seen in both basal and derived mosasaurines.
The subfamily is generally recognised as containing two subdivisions, the tribes Globidensini (Globidens and its closest relatives) and Mosasaurini (Mosasaurus and its closest relatives). A third tribe, the Prognathodontini ( Prognathodon and its closest relatives, such as Plesiotylosaurus ), is also used on occasion. [ 6 ] "
Instead, they primarily relied on stratigraphic associations and Cuvier's 1808 research on the holotype skull. Thus, in-depth research on the placement of Mosasaurus was not undertaken until the discovery of more complete mosasaur fossils during the late 19th century, which reignited research on the placement of mosasaurs among squamates. [8]