Mosasaur
Mosasaurs (from Latin "Mosa" meaning the 'Meuse river', and Greek σαύρος "sauros" meaning 'lizard') are an extinct group of large marine reptiles containing 38 genera in total. 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. During the last 20 million years of the Cretaceous period (Turonian-Maastrichtian ages), with the extinction of the ichthyosaurs and pliosaurs, mosasaurs became the dominant marine predators. They became extinct as a result of the K-Pg event at the end of the Cretaceous period, about 66 million years ago.
List of North American dinosaurs
The only dinosaur fossil from Central America is a femur of a ornithopod., discovered in the central part of Honduras in the year 1971 near San Luis, Comayagua Department, by Bruce Simonson and Gregory Horne. It was found in the highest part of the Valle de Angeles Redbeds. The fossil bone is in the US National Museum of Natural History in Washington (catalog number USNM PAL 181339). It was identified as ornithopod bone by John Ostrom, and by Nicholas Hotton as the right femur of a small hadrosaur.