Mosasaurs (from Latin Mosa meaning the 'Meuse river', and Greek σαύρος sauros meaning 'lizard') are large, extinct, marine reptiles.
The first fossil remains were discovered in a limestone quarry at Maastricht on the Meuse in 1764. Mosasaurs probably evolved from semiaquatic squamates known as aigialosaurs, which were more similar in appearance to modern-day Monitor Lizards.
Currently the largest publicly exhibited mosasaur in the world is housed at the Canadian Fossil Discovery Centre in Morden, Manitoba, Canada. 'Bruce' is just over 13 metres or 43 feet in length!
Discovery: Each tooth/jaw is different, so there may be some slight variations than the image shown.
What is a Fossil?
They are the preserved remains or traces of animals plants and other organisms from the remote past. A fossil normally preserves only a portion of the deceased organism usually that portion that was partially mineralised during life such as the bones and teeth of vertebrates or the chitinous exoskeletons of invertebrates.
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Mosasaur Tooth & Root Fossil in Matrix
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