Do you think 120-150ft is long enough for the largest animal Ramath-lehi? The largest animal on earth is the blue whale and its about 100ft long.
I think it's possible that they're the largest. I'd have to do a little bit more digging to try and confirm that though.
Let's see, we have the Garloc at 'huge' with no precise size given but it's an insect so I can't imagine it getting tooooo big. The Cruork maxing out around 50ft. I thought there was another marine creature in the 'huge' category but it didn't come up with a search. So I'd also lean towards saying that would likely make it the largest.