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Mosasaurus fossils have been found in North and South America, Europe, Africa, Western Asia, and Antarctica. This distribution encompassed a wide range of oceanic climates including tropical, subtropical, temperate, and subpolar. Mosasaurus was a common large predator in these oceans and was positioned at the top of the food chain.
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 .
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]
The Mosasaurus hoffmannii skull found in Maastricht between 1770 and 1774. The first publicized discovery of a partial fossil mosasaur skull in 1764 by quarry workers in a subterranean gallery of a limestone quarry in Mount Saint Peter, near the Dutch city of Maastricht, preceded any major dinosaur fossil discoveries, but remained little known.
English: Size comparison of the mosasaurin mosasaurine mosasaurid mosasauroid Mosasaurus. Mosasaurus hoffmannii is the largest species of this genus. The specimen catalogued as CCMGE 10/2469 (also known as the "Penza specimen") is among the largest known specimens of this species, with an estimated length of around 1.7 m (5.6 ft).
Bell proposed that the Mosasaurini should be abandoned and that all members of the tribe should be incorporated into the Plotosaurini. While other scientists agree that a tribe containing Mosasaurus should be monophyletic, they argue that Mosasaurini should be the valid tribe. For example, in a 2012 study, Aaron LeBlanc, Caldwell, and Bardet ...
Skeletal diagram of Pannoniasaurus inexpectatus, restored with primitive aigialosaur-style limbs. The holotype (MTM 2011.43.1) and referred specimens have been collected from the alluvial sediments of the Csehbánya Formation from various exposures at the Iharkút open-pit bauxite mine, Bakony Hills, Western Hungary since the discovery of the locality in 2000.
This is a list of stratigraphic units from which mosasaur body fossils have been recovered. Units listed are all either formation rank or higher (e.g. group). Units listed are all either formation rank or higher (e.g. group).