No dinosaurs specifically lived in the water. Plesiosaurs, pliosaurs, mosasaurs and ichthyosaurs lived in the water (but are not DINOSAURS). They are reptiles but not dinosaurs. They co-inhabited the planet with dinosaurs, in the same way that the pterosaurs ruled the air. Pterosaurs were not dinosaurs either.
Godzilla
The dicynodon was an ancient dinosaur which lived in Africa. It is estimated that this dinosaur lived 250?æmillion years ago and lived partially on land and in the water.
There are many dinosaurs that have lived on Earth. To find out the sizes of most dinosaurs check on Wikipedia or what have you.
One particular Dinosaur called Hadrosaurs (Duck-billed dinosaur)
they usually live in water were there is a lot of space. Also the water they live in is somewhat shallow. :)The kind of environment in which the mesosaurus lived was a marine environment with a much larger amount of saline than in today's marine environments. The dinosaur spent all of its life in the water.
The fastest dinosaur that ever lived was the cheetah-sized dinosaur called the Compsognathus.
The only known dinosaur to live in Oregon was an unknown species of Hadrosaur.
Dinosaur dont lived Earth any more, they died.
Once upon a time, there lived a lonely but kind old man in a small village.
we can't say, because were discovering more all the time. there is actually no such thing as a dinosaur that spent its whole life in water as one of the definitions of a dinosaur is an animal with steady legs that support it on land. any water animal would have flippers so they cant stand. the animals that lived in the water were just animals that lived in the dinosaur period not actual dinosaurs.
The dinosaur that lived the longest was the Brachiosaurus, which lived around 150 million years ago during the Jurassic period.
Coelophsis was a dinosaur that lived in the Late Triassic Period. The dinosaur is said to have lived in small herds with others.