"Although it can grow as large as a komodo dragon, Palaeosaniwa (Ancient Saniwa) is actually an early relative of the modern Gila Monster (Monstersauria). Like its modern relatives, Palaeosaniwa is venomous, but this feature is used for defence more than prey capture, latching onto threats with its hooked teeth while glands on the lower jaw excrete venom into the wound. This animal acts primarily as a specialized raider of dinosaur nests, making Palaeosaniwa a primary enemy of hatchling-stage dinosaurs and protective parents."

― Saurian encylopedia

Palaeosaniwa was an extinct genus of carnivorous lizard from the late Cretaceous of North America. The name, given by Charles Whitney Gilmore in 1928, means "ancient Saniwa from Canada", Saniwa being another extinct genus of monitor lizard.

Measuring around 3–3.5 m (9.8–11.5 ft) in length, it was among the largest terrestrial lizards known from the Mesozoic period (though Asprosaurus may compete with it in size).

Palaeosaniwa's teeth were sharp and flattened like blades, with small serrations along the edges, indicating it was a carnivore. Palaeosaniwa fed on small vertebrates, including mammals and other reptiles, like small dinosaurs including the young of larger species. Palaeosaniwa itself was likely prey to the predatory dinosaurs it shared its habitat with.

Palaeosaniwa is a member of Platynota, a group that includes the monitor lizards (Varanidae) and Gila monsters (Helodermatidae) which could mean it might have had venom similar to that of a Komodo dragon or Gila monster. Originally, it was thought to be a member of the Varanidae, but has also been interpreted as a relative of the Helodermatidae. The most recent analysis places Palaeosaniwa outside of either Varanidae or Helodermatidae, as a stem member of the Varanoidea, although still under debate.

In Saurian  Edit

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Adult Dakotaraptor staring at a Palaeosaniwa.

"Palaeosaniwa have venomous bites. When poisoned your health meter will pulse. The frequency of the pulse indicates how much the venom is hurting you -- stay well-fed and hydrated to counteract it."

― Saurian info guide, displayed when the player is bitten by a Palaeosaniwa

It is portrayed looking very similar to a Gila monster, with thick, warty scales and a black and bright orange color palette.

Palaeosaniwa is one threat to the player while they are young, as its diet included young or small dinosaurs. It is able to sprint a little bit, and buffs the player with intimidating sounds. If the player gets bitten by this lizard, the inflicted effects of the venom can lead to the player's death, if he/she isn't careful. Palaeosaniwa will likely charge and try to kill the player when young, but will prefer buffing the player if he/she is an adult, avoiding attacks. The venom usually only kills the player if they are very young or if they are damaged, that is, the player must be older and stay hydrated and well fed to survive. Palaeosaniwa are risky as a hatchling Dakotaraptor, but juveniles can take one down, although it is dangerous. Subadults and adults can be damaged by their venom, but usually taking one down is easier and less risky.

Paleosaniwa do not have sexual dimorphism or ontogenic stages, currently.