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No. Plesiosaurs were marine reptiles, not dinosaurs. Saurichians were one of the two main groups of dinosaurs (which included sauropods - such as Apatosaurus - and theropods - such as T. rex).

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Who found out about Dinosaurs?

First off, plesiosaurs and pterodactyl were not dinosaurs. Plesiosaurs were their own group of reptiles more closely related to lizards than to dinosaurs. Pterodactyl was a pterosaur, which were a group separate from, but related to dinosaurs. Plesiosaurs are generally considered to have been discovered by Mary Anning. Pterosaurs are said to have been discovered by Cosmio Collini.


Does a plesiosaur a dino?

Plesiosaurs were not dinosaurs. They were a clade of marine reptiles that lived at the same time as the dinosaurs.


What were the names of the swiming dinosaurs?

There were no ocean dwelling dinosaurs. Large marine reptiles that are often thought of as dinosaurs include plesiosaurs, pliosaurs, mosasaurs, and icthyosaurs.


What are three types of dinosaurs that live in Antarctica?

They include Ankylosaurs (the armored dinosaurs), Mosasaurs, and Plesiosaurs (both marine reptilian groups).


Which dinosaurs live in water?

No dinosaurs lived in water. The prehistoric reptiles that lived in water were the Plesiosaurs, not dinosaurs.


Is loch ness monster a dinosaur?

No plesiosaurs are not dinosaurs. Besides, there's no real evidence that it exists.


What is one dinosaur fact?

Most dinosaurs are reptilian, with scales. However it is possible that some dinosaurs are warm blooded. Plesiosaurs, Ichythosaurs, Mosasaurs, and Pterosaurs aren't dinosaurs; they're just related to them.


What was the largest prehitoric aqua dinosaur?

There were no aquatic dinosaurs. Some prehistoric marine reptiles are mistakenly called dinosaurs. These include plesiosaurs, pliosaurs, icthyosaurs, and mosasaurs.


What kind of dinosaur lived in the water?

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.


What do they call dinosaurs that lived in the sea?

No dinosaurs lived in the sea. There were other reptiles that adopted a marine life, but those weren't dinosaurs.


What Dinosaurs in the water?

Dinosaurs were all terrestrial creatures, although a few, such as Spinosaurus and Baryonyx, specialized in freshwater fishing. Large marine reptiles that were not dinosaurs but existed at the same time include plesiosaurs, pliosaurs, icthyosaurs, and mosasaurs.


What is an archosaurs?

An archosaur is a reptile of the taxon Archosauria, including the extinct dinosaurs, plesiosaurs, pterosaurs and ichthyosaurs, as well as modern crocodiles.