The Tusoteuthis was an unusually large Cephalopod, being an alike size to the Architeuthis in the modern world. Recent studies, however, suggest that it was much more closely related to Vampire Squids (Vampyroteuthis infernalis). The squid is rather powerful for it's price, with fairly high damage and speed; however, it's attacks are slow. Health and defense, however, are underwhelming and nonexistent respectively, doubtless as a result of it's soft skin. In the same vain as Mayhem dinosaurs, it changes it's color upon roaring, though it's entire body changes instead of a certain portion as in the Mayhem dinos.
In the game it is most infamous for the glitch it is able to carry out, known typically as squidglitch or any variation on that name. By putting the squid head first against a vertical surface, switching the camera to face outside the map and then scrolling into first person the Tusoteuthis may appear on the other side of the map.
Whilst possible before, this glitch is easiest to carry out with a Tusoteuthis.
As a result of this, individuals have been going under the map, putting a nest there and spawning under the map as a new skinned Mosasaurus, whose large model (though not visually) allows them to hit dinosaurs on standard elevation from beneath the ground.
This is not impossible to counter; Baros with their AOE can other large AOE dinos can hit the under-map attackers, but the best counter for this is to simply move to higher ground.