40 - Dimetrodon

Dimetrodon grandis

Common Name Dimetrodon
Group Synapsids
Species Dimetrodon calorector
Time Early Permian
Diet Carnivore
Temperament Reactive
Egg Dimetrodon Egg
Feces Size Small
XP For Kill 4 XP
PC Release Date January 15, 2016 (v232.0)
Xbox Release Date February 12, 2016 (v731.0)
Favorite Kibble Kibble (Quetzal Egg)
Tameable Yes
Rideable No
Incubation Range 30 - 34 °C / 86 - 93 °F
Incubation Time 2h 29m 59s
Baby Stage Time 4h 37m 46s

Dimetrodon Calorector is a much calmer predator than most on the island.

Because it lives off smaller prey than humans, it generally ignores anything much larger than a Coelacanth.

Dimetrodon is one of the few carnivores on the island that could be classified as reasonably friendly in the wild.

The sail on Dimetrodon's back is a fascinating thing. It can be angled to provide shade from the sun, and allows Dimetrodon to disperse heat more quickly.

The inner workings of the sail can also restrict blood flow in the creature to hold in excessive heat. Together, these two traits allow Dimetrodon to comfortably survive in any climate, though they are most commonly found in the swamplands which are rich in prey.


If Dimetrodon was a bit larger, or didn't have that massive sail, it would make a decent mount. However, its main use to survivors is to utilize the sail's insulating capabilities. Just being near a Dimetrodon gives excellent protection from the heat and the cold, which has saved my life through more than one ice blizzard in the frozen mountains!

— The Dossier

The Dimetrodon is a medium sized carnivorous mammal (synapsid) found on the Ark.

Wikipedia has a more detailed and comprehensive article on Dimetrodon


A sail-backed quadruped found exclusively in the island's central swamps, Dimetrodon is reptilian in appearance but in truth is more closely related to mammals. The large sail on its back serves a thermoregulatory function, as it cools the animal on hot days and helps keep it warm on cold ones. They are fairly timid and sluggish, specializing in hunting prey that is smaller than themselves.


Usually attacking Coelacanth or a Megapiranha, the Dimetrodon is not too much of a worry for anything, unless it's provoked by attacks. However, the Dimetrodon is extremely slow and provoking it does not pose much of a threat, as it is easy to out run or kill them.





  • The dossier was revealed on July 3, 2015.
  • The dossier mentioning that the massive sail prevents the Dimetrodon from being a decent mount could be a humorous reference to the fact that for Spinos the saddle rests on the creature's neck.

Trivia not relevant for the game

  • Even though this creature is often mistaken for a dinosaur, it is actually a Synapsid, which includes mammals and other relatives of Dimetrodon.
  • In many dinosaur related media, this creature is seen living alongside the dinosaurs. This is a mistake, as Dimetrodon was extinct long before the dinosaurs ruled the earth. In fact, the timegap between Dimetrodon and many of the more popular dinosaurs, like Triceratops and Tyrannosaurus Rex is much bigger than the gap between humans and aforementioned dinosaurs.


Gameplay Images



Spotlight Dimetrodon & Dung Beetle!

Spotlight Dimetrodon & Dung Beetle!