This section is intended to be an exact copy of what the survivor Helena Walker, the author of the dossiers, has written. There may be some discrepancies between this text and the in-game creature.
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Species
Lystrosaurus amicifidelis
Time
Late Permian - Early Triassic
Diet
Herbivore
Temperament
Loyal
Wild
Lystrosaurus amicifidelis is a small herbivore, common to much of the Island. Only about two feet long, it is not high on the food chain, and eats small plant life. The Island's poisonous insects seem to have little effect on Lystrosaurus.
Despite being among the Island's tinier herbivores, Lystrosaurus is an incredibly resilient survivor. It recovers its torpor and health much faster than most creatures, which makes rendering a Lystrosaurus unconscious a rather difficult affair.
Domesticated
Not surprisingly, Lystrosaurus is an extremely loyal pet once tamed. It's a very fast learner, so it gains experience much more quickly than most other creatures. Additionally, its presence nearby appears to inspire allies, making them learn more rapidly as well. Thusly, Lystrosaurus is an excellent addition to any tribe's hunting party.
The Lystrosaurus is passive. It will walk around aimlessly until attacked, at which point it will flee, albeit very slowly. A Lystrosaurus will attack if the player steals its egg.
Appearance
The Lystrosaurus is a stout mammal-like reptile often described as resembling a reptilian pig. Like wild pigs, they are usually seen snuffling the jungle floor for food using two small canine teeth and a small but strong beak. The Lystrosaurus's only true defense is their stealth, being small and quiet makes them incredibly difficult to find.
Color Scheme and Regions
Region 0:Body
Natural colors:
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21
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Region 1:Unused
This region does not show on the body.
Region 2:Unused
This region does not show on the body.
Region 3:Unused
This region does not show on the body.
Region 4:Underside
Natural colors:
8
21
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Region 5:Spine and Feet
Natural colors:
22
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This section displays the Lystrosaurus's natural colors and regions. For demonstration, the regions below are colored red over an albino Lystrosaurus. The colored squares shown underneath each region's description are the colors that the Lystrosaurus will randomly spawn with to provide an overall range of its natural color scheme. Hover your cursor over a color to display its name and ID.
This information can be used to alter the Lystrosaurus's regions by entering cheat SetTargetDinoColor <ColorRegion> <ColorID> in the cheat console. For instance, cheat SetTargetDinoColor 0 6 would color the Lystrosaurus's "body" magenta.
Type in values of a wild creature to see on which stats it's emphasized. Green values on a high-level creature are very good for breeding. If you have already tamed your creature you can try to recover the breeding stats with an external tool.[2]
Lystrosaurus
The stat-calculator does not work in the mobile-view, see here for alternatives: Apps
Note that after the creature is tamed it gets bonuses on some stats depending on the taming effectiveness. This makes it hard to retrieve the levels on a tamed creature, so this tool is only for wild ones, but gives a first impression, how well the stats are distributed.
Can be used every 0.89s by both a rider and the AI.
Passive
Exp Boost
After pet it, the Lystrosaurus gives Fast Learner buff to all ally creatures nearby, increasing their experience multiplier by x1.35 for 5 minutes. This effect will only last 10 seconds after an affected creature go too far from the Lystrosaurus.
Taming
Note: Although the DevKit has data for taming with Vegetables, the Lystro doesn't accept these as food.
Note that the values are for optimal cases, always bring extra supplies!
For a level-dependent count of resources needed, try an external taming calculator.
Taming Strategy
Lystrosaurus is tamed by hand-feeding rather than through the use of tranquilizers. To feed one you will need to place an appropriate food in the far-right slot of your hotbar and get close enough to the creature for the button prompt to appear. Lystrosaurus will take one piece of the food from your inventory and will play an eating animation. You must wait for the creature's hunger to go back down before it can be fed again, a process which takes some time, depending on the level and the food.
This section describes how to fight against the Lystrosaurus.
General
Killing a Lystrosaurus should be relatively easy and straight forward, comparable to fighting a dodo. Even a level 1 survivor can kill one with ease. Although keep in mind, it will attack if you steal it's egg
Strategy
Keep attacking it until it dies. The Lystrosaurus will attempt to run away, but it is relatively slow, and is easily caught up to.
Weaponry
Any kind of weaponry will do, even your bare hands will do the trick.
Weakness
The Lystrosaurus has low HP and is slow, even when running. It will also not attack you when harmed, it will flee instead.
Dangers
While not a threat themselves, Lystrosaurus will typically share its environment with other carnivores like Dilophosaurs. Lower level players should keep an eye out for potential threats in the area before attacking.
Utility
Nearby dinos receiving the Lystrosaurus' buff after being pet.
XP Boost
The Lystrosaurus' unique ability allows it to give tamed dinos an experience boost that lasts about 5 minutes. Simply walk up to and pet the Lystrosaurus to enable this buff. It will need to be pet again after the buff fades. For this reason, it's advised to have a Lystrosaurus follow you while you level up your pets. The buff multiplies all XP gains by 1.35.
If you want to use the experience boost with a larger dinosaur, it's recommended to use more than one Lystrosaurus because the buff range will increase with each one. To boost a Brontosaurus put the Lystrosaurus as near as possible to the Bronto's front legs.
There are some interesting ways to keep the Lystrosaurus close to your tames while in movement, a player can carry one with a Pteranodon or Tapejara. It can also be transported on a Platform Saddle, however its range might be limited due to the fact that it is higher than usual. Finally, the Lystrosaurus can be picked up by Procoptodon, Kaprosuchus, and Argentavis using their pouch, jaws and beak, respectively without the need for the player to continue riding after the mount has grabbed the Lystrosaurus, allowing the player to do other things while the mount that picked up the Lystro follows him.
Roles
XP Booster: When pet, a Lystrosaurus will boost XP gains from all nearby allied dinos, including other Lystros.
Egg Layer: Lystros lay eggs fairly quickly, which can be eaten, but the eggs can also be made into kibble for taming or for Imprinting.
Companion: Lystrosaurus is also just an all around cute companion to have in your base. (Level up Health so it's harder to kill)
Yes 
Region 0:
Region 4:
Region 5:
Experience boost.
ARK: Survival Evolved on 4th of May, 2016.
Aberrant Lystrosaurus is the Aberrant variant of Lystrosaurus found in Aberration. It is identical to the normal specie except for its glowing robe. It is tameable and is not 
Radiation immune.
Health
Stamina
Oxygen
Food
Weight
Melee Damage
Movement Speed
Torpidity
Exp Boost
Fast Learner buff to all ally creatures nearby, increasing their experience multiplier by x1.35 for 5 minutes. This effect will only last 10 seconds after an affected creature go too far from the Lystrosaurus.
Level 1
Rare Flower
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Fresh Barley 
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Fresh Wheat .png){kind=small}
Soybean 
Mejoberry
Berries
Brontosaurus put the Lystrosaurus as near as possible to the Bronto's front legs.
Pteranodon or 
Tapejara. It can also be transported on a Platform Saddle, however its range might be limited due to the fact that it is higher than usual. Finally, the Lystrosaurus can be picked up by 
Procoptodon, 
Kaprosuchus, and 
Argentavis using their pouch, jaws and beak, respectively without the need for the player to continue riding after the mount has grabbed the Lystrosaurus, allowing the player to do other things while the mount that picked up the Lystro follows him.
Thatch Doorframe, 
Wooden Doorframe, 
Stone Doorframe, and 
Metal Doorframe (each including their doors).
Rare Flowers in Primitive Plus.
The Aberrant variant has glowing stripes.
