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Mosasaurus fossils were found in the Seymour Island of Antarctica, which once provided cool temperate waters. Mosasaurus is known from late Maastrichtian deposits in the Antarctic Peninsula, specifically the López de Bertodano Formation in Seymour Island. [92]
Mosasaur bones have also been found with shark teeth embedded in them. One of the food items of mosasaurs were ammonites, molluscs with shells similar to those of Nautilus, which were abundant in the Cretaceous seas. Holes have been found in fossil shells of some ammonites, mainly Pachydiscus and Placenticeras. These were once interpreted as a ...
Representatives of M. conodon from the Midwestern United States were found to belong to M. missouriensis, while its East Coast representatives became a new genus subsequently named Aktisaurus while preserving the specific epithet conodon. Lastly, the study found IRSNB R12 skull to be a distinct species of Mosasaurus.
A 2022 analysis found that mosasaurs were most closely related to Varanoidea, and stated that they "consider most characters previously reported as supporting the Pythonomorph Hypothesis to be problematic, because of incomplete fossil preparation, artefacts of taphonomy, limited comparisons, misinterpretations of anatomy, incomplete taxon ...
Caitlin Kiernan observed that different kinds of mosasaurs were found at different stratigraphic levels within the Eutaw Formation and Selma Group of Alabama. She described three biostratigraphic zones within this interval based on their mosasaur content: the Tylosaurus acme zone, the Clidastes zone, and the Mosasaurus acme zone.
Its ear bones, which were somewhat rectangular, resembled those of Mosasaurus, the genus of mosasaur giants. But the shape and high number of its teeth were a closer match to a genus of smaller ...
It is the second documented discovery of mosasauroid fossils and was found between the 1770s and early 1780s. [3] [4] It was brought to Paris after the siege of Maastricht, where it was studied by Cuvier. [4] Mosasaurus missouriensis: Mosasaurus: The Goldfuss Mosasaur MNHN 9587/RFWUIP 1327 Muséum national d'Histoire Naturelle/Goldfuß Museum ...
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 ...