Kronosaurus boyacensis

Monquirasaurus is an extinct genus of giant short-necked pliosaurs who lived during the Early Cretaceous (Aptian) in what is now Colombia. One species is known, M. boyacensis, described in 2021 from an almost complete fossil skeleton, discovered in 1977 in the town of Villa de Leyva, located in Boyacá. Published descriptions of the holotype specimen estimate that it should reach a total size approaching 9–11 m (30–36 ft) in length and weighing nearly 10 metric tons, making Monquirasaurus a large representative of the pliosaurids.