An earlier hypothesis that the striations would function as sockets for sharp needle teeth, as with the basking shark, was hereby refuted.
en.wikipedia.org They include the goblin shark, basking shark, megamouth shark, the thresher sharks, shortfin and longfin mako sharks, and great white shark.
en.wikipedia.org Possibilities include the frilled shark, basking shark, oarfish, giant squid, seiches, or whales.
en.wikipedia.org Though the basking shark is large and slow, it can breach, jumping entirely out of the water.
en.wikipedia.org While initial speculation suggested it might be a prehistoric plesiosaur, analysis later indicated that the body was the carcass of a basking shark.
en.wikipedia.org