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Mosasaurus (/ ˌ m oʊ z ə ˈ s ɔːr ə s /; "lizard of the Meuse River") is the type genus (defining example) of the mosasaurs, an extinct group of aquatic squamate reptiles.It lived from about 82 to 66 million years ago during the Campanian and Maastrichtian stages of the Late Cretaceous.
The smaller mosasaurs may have spent some time in fresh water, hunting for food. The largest mosasaur Mosasaurus hoffmannii was the apex predator of the Late Cretaceous oceans, reaching more than 11 metres (36 ft) in length and weighing up to 10 metric tons (11 short tons) in body mass. [14]
Molnar's 2004 assessment resulted in an average weight of 320 kg (710 lb) and length of 4.5 m (15 ft), and a maximum of 1,940 kg (4,280 lb) at 7 m (23 ft) in length, which is toward the high end of the early estimates. [16] However, a 2009 study estimated megalania at 5.5 m (18 ft) and 575 kg (1,268 lb). [17]
The largest extant turtle is the leatherback sea turtle (Dermochelys coriacea), reaching a maximum total length of 3 m (10 ft) and a weight of 961 kg (2,119 lb). [1] [96] The second-largest extant testudine is the Loggerhead sea turtle. It tends to weight slightly more average weight than the green sea turtle, and reaches more massive top sizes.
The heaviest known pantherine felids are the Ngangdong tiger (Panthera tigris soloensis), which has been estimated to have weighed up to 486 kg (1,071 lb), [177] the extinct leonine Panthera fossilis, which has been estimated to have maximum weight of 400–500 kg (880–1,100 lb), [183] the American lion (Panthera atrox), weighing up to 363 kg ...
A tylosaurine mosasaur that had more vertebrae in the neck and tail than its Tylosaurus cousin. It is one of the largest mosasaurs, though its size has been revised more than once. †Halisaurus †Halisaurus platyspondylus; USA With a length of 3–4 m (9.8–13.1 ft), this species of halisaurine mosasaur is small compared to most other mosasaurs.
Skeleton of Clidastes liodontus mounted as if pursuing a fossil sea turtle. Russell (1967, pp. 123–124) [6] defined the Mosasaurinae as differing from all other mosasaurs as follows: "Small rostrum present or absent anterior to premaxillary teeth.
Mosasauroidea is a superfamily of extinct marine lizards that existed during the Late Cretaceous.Basal members of this group consist of small semiaquatic forms with terrestrial limbs ("plesiopedal"), while laters members include larger fully aquatic paddle-limbed ("hydropedal") forms commonly known as mosasaurs. [3]