. . "Mosasaurs (from Latin Mosa meaning the 'Meuse river', and Greek \u03C3\u03B1\u03CD\u03C1\u03BF\u03C2 sauros meaning 'lizard') are an extinct group of large marine reptiles. Their first fossil remains were discovered in a limestone quarry at Maastricht on the Meuse in 1764. Mosasaurs probably evolved from an extinct group of aquatic lizards known as aigialosaurs in the Early Cretaceous."@en . .