What is the biggest dinosaur in the ocean?

Answer 1

Strictly speaking, the sea lizards were NOT dinosaurs, but their contemporaries. The largest of these was probably the Liopleurodon. An even bigger creature, Basilosaurus, was, despite the name, not a sea lizard, but a whale.

Answer 2

No dinosaurs lived in the ocean. However, there were some large marine reptiles during the Mesozoic. The longest known was Shastasaurus sikkanniensis, a 69 foot long icthyosaur, or fish-like reptile. There were also mosasaurs, which were huge marine lizards, the longest of which was Hainosaurus, at 57 feet long. One of the longest plesiosaurs was Elasmosaurus, at 49 feet.

Answer 3

Basilosaurus cetoides, a huge pre historic marine mammal is thought to be the biggest sea creature ever. It measured 40-65 feet.

Answer 4

First of all, these are not dinosaurs. They are pliosaurs.

Answer 5

Crockadile