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Size range of Mosasaurus compared with a human. The type species, M. hoffmannii, is one of the largest marine reptiles known, [25] [57] though knowledge of its skeleton remains incomplete as it is mainly known from skulls. [38]: 100 Russell (1967) wrote that the length of the jaw equalled one tenth of the body length in the species.
Jormungandr is a large mosasaur. The holotype skull measures 72 centimeters (28 in) in total length and the lower jaw is 80.8 centimeters (31.8 in) long. [2] Based on these measurements, Zietlow and colleagues estimated a total body length of 5.4–7.3 meters (18–24 ft). [3] [4] Size of Jormungandr compared to a human
Megapterygius is a medium-sized mosasaur with an estimated skull length of 0.8 metres (2.6 ft) and a body length of approximately 6 metres (20 ft). Both the front and hind flippers are longer than the skull.
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]
However, the scales in the mosasaur were much smaller in proportion to the whole body. [103] [104] An individual measuring 5 meters (16 ft) in total body length had dermal scales measuring 3.3 by 2.5 millimeters (0.130 in × 0.098 in), [105] and in each square inch (2.54 cm) of the mosasaur's underside an average of ninety scales were present ...
Size compared to a human as a mosasaurine Goronyosaurus is a small mosasaur, measuring up to 5.14 m (16.9 ft) long. Previously the body length had been estimated at 7.8 m (26 ft), although Soliar (1988) identified that this length estimate was based on a false skull length to body length ratio (9.1:100).
Lisowicia compared to a human. The plant-eating dicynodont Lisowicia bojani is the largest-known of all non-mammalian synapsids, at about 4.5 m (15 ft) long, 2.6 m (8 ft 6 in) tall, and 9,000 kg (20,000 lb) in body mass.
Williston also discussed mosasaur life appearance and behavior. He compared mosasaur scales to those of monitor lizards and misinterpreted some fossilized cartilage as evidence for a fringe of soft tissue down mosasaurs' backs. [50] He hypothesized that mosasaurs left the safety of the water to lay eggs on land. [51]