"The trunk of the Ectenosaurus was fairly rigid and Ectenosaurus most probably had a tail fluke too."


The Ectenosaurus (drawn-out lizard) is a small, pretty chubby mosasaur. Its back is grey-blue and its belly is white, and it is really blocky for the time of its release and for the Dinosaur Simulator model standards of today. Despite this, it's well animated. Some players may call it the "sea potato.'' It looks like a modern day manatee or dugong only with a carnivor-like head.


It's one of the weakest and one of the smallest sea predators in the game, along with it being one of the least well known. Due to it being both weak and fast, most players scavenge when using this, eating drowned animals and the prey of larger sea predators. Since it can outswim most threats, it can live near other creatures without having to worry about being hunted down. It is recommended not to fight; to just eat fish and scavenge. If the player wants to fight like an ankle-biter,hitting somebody and then running away, repeat this tactic until they kill them.

It lived in Texas and Kansas, in the Cretaceous 86-83 MYA. It came out in the update that also added Fresnosaurus, Balaur, and Tarbosaurus.


  • The weakest Mosasaur out of the 3 Mosasaurs available to play as in-game. 
  • The fact that it has a low-quality model with good animations makes it very unique in that aspect. 
  • The model of this animal was made around 2015-2016 and was later added without any improvements in the model. 
  • It is one of the most obscure genera of organism added to Dinosaur Simulator, if not the most obscure. 

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