Ark already suggested this creature and no one picked it because, well, a giant bat you can ride.
Credits to PhlippinPhil
But that doesn't matter! because i feel like the Ceratosaurs didn't get enough love and attention, and i feel like Ceratosaurs would of been an amazing mount and even known Ceratosaurus is small, but ark made the giga way to big. so why not add Ceratosaurus.
Credits to Kaprodonychus on steam
Ceratosaurus means 'Horned Lizard' The Dinosaur was given its name because it had a row of sharp horns on its head and a row of small bony pieces running along its back. Ceratosaurus was a carnivorous theropod dinosaur in the Late Jurassic period. The genus was first described in 1884 by American paleontologist Othniel Charles Marsh based on a nearly complete skeleton discovered in Garden Park, Colorado, in rocks belonging to the Morrison Formation.