Length: 52 feet
Weight: 10 tons
Distinct from the single individual exhibited on Nublar, this species originated from Sorna and emigrated to Nublar by following schools of Ichthyosaurus and dolphins over the open sea.
- Adult and juvenile (both sexes): Upper part of the body is a dark mottled green, with a lighter underside.
Diet: Turtles, fish, sharks, seabirds, pterosaurs, dolphins, Ichthyosaurus, whale carcasses, drowned animals.
Preferred habitat: Shallow nearshore waters.
Social structure: Solitary.
Tylosaurus is well adapted to an aquatic lifestyle. Its body is long, slender, flexible and streamlined. All four limbs are modified into paddle-like flippers, and the long tail has a fluke at the end.
Tylosaurus has an incredibly flexible body more akin to a snake than any lizard. It is able to squeeze its way through anything as long as its head can fit, and it is particularly fond of exploring the shipwrecks off the coasts of Nublar and Sorna in search of food. Like the Megalania, Tylosaurus sometimes become involved in feeding frenzies over the corpses of dead whales or drowned animals. It is also capable of leaping from the water to snatch a seabird or pterosaur from the air.
These reptiles are fighters through and through, and their underwater clashes are a sight to see. Although somewhat protected with its armor-like skin, its flippers and tail are not so well protected, and it is not entirely uncommon to see an individual with a missing limb or large rips in the webbing of its tail. Like manatees, their flippers end in nails, and these are used to allow the male to get a better grip on a female during mating.
Tylosaurus jaws are long and narrow, and the snout has a bony tip at the end, used as a ramming weapon. Tylosaurus is not a fast swimmer - instead of chasing after prey, it uses the cover of seaweed and rocks in order to get close before making a sudden burst of speed at the last minute, ramming into the victim with its hard, bony-tipped snout. Stunned by the impact, the prey is then killed by Tylosaurus jaws.
Like snakes and lizards, Tylosaurus' tongue is forked and it also has a Jacobson’s organ: a structure used by snakes and lizards to detect scent particles in air and water. This means that Tylosaurus has an exceptional sense of smell for detecting prey. Although streamlined for quicker propulsion through the salty ocean waters, the skin of Tylosaurus is similar to that of its closest modern relatives, the Varanidae, in having an almost chain-mail quality to it, thus able to withstand even the sharpest of teeth.
Tylosaurus gives birth to a single live offspring, and the mother guards the juvenile for the first few weeks of its life.