The sea dragon
That creature doesn't really look like a dragon. Sea or otherwise. Unless they chose to call it a dragon for lack of a better word. It would've sounded weird to call it Rise of the Sea Kaiju, or Rise of the Sea Creature.
But enough of that. My question is: is that a dragon or not?
Logan: I don't know!
Rogue: You don't know, or you don't care?
Logan: Pick one. X-Men