Researchers from the University of Bata and Portsmouth University in Great Britain found the fossils of the plyzosaurus in a river system that had already disappeared and had been in the current Sahara desert in Morocco for over 100 million years.
The remains belonged to a relatively small species of plyzosaurus, which consisted of bones and teeth, which were adults three metres long and young, reaching 1.5 metres.
Plesiosaurs are a group of prehistoric aquatic reptiles that had long necks, small heads and four limbs that looked like lasts. They existed for about 150 million years and died at the same time as dinosaurs, 66 million years ago.
This discovery suggests that the plasiosaurus were not exclusively marine animals, and, like the current dolphins, many of these lizards were attended by those who preferred salty fresh water.
They may have lived in the river for a long time, or even permanently, and it is assumed that the plesiosaurus have remained in the river long enough to lose and grow their teeth.