Bidspirit auction | Fossilized Squalicorax shark tooth in

Fossilized Squalicorax shark tooth in a glass capsule.. - The fossil is millions of years old. Country of origin - Morocco. Capsule height - 6 cm. ”Mosasaurus is the type genus of the Mosasaurus, an extinct group of squat aquatic reptiles. It lived about 82 to 66 million years ago, during the Campanian and Maastrichtian stages of the Late Cretaceous. The genus was one of the first Mesozoic marine reptiles known to science - the first fossils of Mosasaurus were found as skulls in a limestone quarry near the Dutch city of Maastricht in the late 18th century, and were initially thought to be crocodiles or whales. One skull, discovered around 1780, was famously nicknamed the ”Great Beast of Maastricht”. In 1808, the naturalist Georges Cuvier concluded that it belonged to a giant marine lizard that resembled monitor lizards but was different from any known living animal. This concept was revolutionary at the time and helped support the ideas of extinction that were developing at the time. Cuvier did not assign a scientific name ”To an animal; William Daniel Conyver did so in 1822 when he named it Mosasaurus in reference to its provenance in fossil deposits near the River Meuse. The exact lineage of Mosasaurus as a killer remains controversial, and scientists continue to debate whether its closest living relatives are monitor lizards or snakes.”