| Named By: | Maria Paramo in 1994 |
| Time Period: | Turonian, 90 Ma |
| Location: | Colombia - Villeta Formation |
| Size: | Holotype skull is 47 centimetres long that when compared to partial post cranial remains suggest a total length of 5 meters. A second skull that is 87 centimetres long indicates a longer 9 meter long individual when scaled to the same estimated proportions as the holotype |
| Diet: | Carnivore/Piscivore |
| Fossil(s): | Articulated skull with some post cranial skeletal elements of vertebrae and ribs. Second skull also known |
| Classification: | | Chordata | Reptilia | Squamata | Mosasauridae | Plioplatercarpinae | |
Yaguarasaurus is an extinct genus of mosasauroid from the Late Cretaceous (Turonian) period of Colombia, South America. The remains discovered (an articulated skull, some vertebrae and ribs) were defined as a new genus and species of mosasaurid, Yaguarasaurus columbianus, by the Colombian paleontologist Maria Paramo, former director of the Museo de Geologia Jose Royo y Gomez of INGEOMINAS in Bogota. The first fossils remains of this animal suggested a cranial length of 47 centimetres (19 in) and a total length of 5 metres (16 ft); an additional skull that measures 87 centimetres (34 in) long implies a larger size.
This reptile is a member of the family of marine lizards Mosasauridae characteristic of Middle and Upper Cretaceous, with global distribution, but in South America known only through isolated remains (Price, 1957, Pierce and Welles, 1959 ; Bonaparte, 1978; Ameghino, 1918). This mosasaur discovered in Yaguara, was at the moment of discovery the most complete material known in South America.