Dododex
ARK: Survival Evolved & Ascended Companion
Tips & Strategies

Outside of not having saddle armor and being harder to tame, this little guy is essentially an upgraded Ichthyosaur. They give you oxygen like a scuba tank (abd available much much earlier) and are the best creatures for harvesting trilobites. Just don't expect much in the way of combat capability. You can't shoot off the back though, which reduces their usability for underwater taming. Perfect for resource cave runs. As they are amphibious you can take them over land to places other aquatics can't reach, although you will want a flyer to carry them because of how slow they are. Even a Pteranodon will work.
They're also skrunkly little salamanders, it's impossible not to love them.
More Diplocaulus Utility Tips
These guys are the kings of trilobite hunting. Not only do they deal additional damage to them, they're great at collecting chitin, oil, and pearls. Other perks: they don't need a saddle to be ridden while in the water, they provide you with oxygen underwater, and are faster than just about anything while swimming. Super underrated mounts imo.
Please listen to me! I haven't had these guys for long, but I noticed their healing was very low, about 0.1, while on land. When I went into the water with it so it could swim, the healing went up to about 1.2 per second. But the biggest thing is, I force fed it meat to heal, like with all carnivores. If you do this in the water, it heals hundreds with just a few pieces! I am going out to the seas in a bit. Knowing this healing factor will help a lot!