Ichthyosaurus Curiosa is a comparatively small carnivore found in the waters around the island. It is slightly larger than a human, but that's still small compared to the leviathans roaming these waters. It seems to be very interested in any creature around its size, often approaching and following humans swimming through its waters.
Despite its appearance, the Ichthyosaurus is neither a fish nor an ocean mammal. Like many creatures in the waters around the island, it is actually an aquatic reptile.
I can't think of a better mount for someone starting to explore the island's seas and waterways. Ichthyosaurus is comparatively fast swimmer, and even in the wild will cozy right up to you and try to figure out what you're doing. Taming these is actually pretty easy, as they seem to love humans and will be fed and tamed without the use of violence.
— The Dossier
The Ichthyosaurus or Ichthy is a small carnivorous dolphin/swordfish-like reptile found in the oceans of the Ark. The Ichthyosaurus has good speed under water and can even take on a Spinosaurus. It primarily feeds on fish like Coelacanth. It is not yet confirmed if the Ichthyosaurus is breedable or not.
- The Ichthyosaurus can defend itself quite well in the water, if its fast enough. It can bite a Megalodon's tail and avoid retaliation, making it decent at defending itself at sea.