Leedsichthys, along with a number of other animals we have talked about in our "Top Ten: Extinct Sea Monsters:" Basilosaurus, Elasmosaurus, Dunkleosteus, Archelon, Megalodon, Tanystropheus, and, of course, Leedsichthys. Hesperornis is also on there, as well.
Megalodon Shark Largest Predator Ever - Jurasic Infographic #prehistoric More
Top 10 Terrifying Prehistoric Sea Monsters - Megalodon
Megaladon facts and info.
Giant Shark filmed off Japan - "When trying to ascertain its size, researchers took into account the dimensions of the bait container, as well as the length of other sharks that can be seen in the footage before the monster shows up, which were judged to be around 2 meters (6.5 feet) long. Using these as size comparisons, the mystery shark was estimated as being at least 30 feet long, with more exaggerated estimations putting it at more like 50 or 60 feet long."
Megalodon | Sharkopedia
Megalodon Sharks: The Ocean Nightmare
I actually knew it was a megaladon.
In honor of shark week 2014 - Comparative sizes of sharks in pop culture. :)