Mosasaurus Ark Mobile
The Ark Mobile game has a premium saddle for such sea dinos as Mosasaurus and Megalodon. You can purchase them ready-made at the Primal Pass store or make them yourself if you have a drawing. Drawings for premium tek saddles can be obtained in the dungeon by completing the dungeon and killing the Boss. A drawing from Dungeon for a tek saddle can have very high armor and cost to manufacture.