What is the extinct animal that lived in the sea at the time of the dinosours?

Question

What is the extinct animal that lived in the sea at the time of the dinosours?

Answer 1

i know there were omanytes(i dont know how to spell it) they were basically squids with a spiral shell that would grow as the  "squid" got bigger

Answer 2

There were many, including fish, plesiosaurs, crocodiles, and mollusks.

Answer 3

There were a lot so you'd have to give a little more information.

Answer 4

If you are talking about the one that kinda looks like a sauropod dinosaur maybe you mean a Pleisiosaur.  I hope this helps,your question was very general.  Maybe you could give some details about what it looks like.