from The Century Dictionary.
- noun A genus of plesiosaurs from the Middle and Upper Oölite, having the head large and the neck comparatively short. Also
from the GNU version of the Collaborative International Dictionary of English.
- noun (Paleon.) An extinct genus of marine reptiles allied to Plesiosaurus, but having a much shorter neck.
Sorry, no etymologies found.
Natural History Museum in Oslo, Norway has announced the discovery of one of the largest dinosaur-era marine reptiles ever found - an enormous sea predator known as a pliosaurus estimated to be almost 15 meters (50 feet) feet long.
Land reptiles abounded, including species of the pterodactyle of the preceding age -- tortoises, trionyces, crocodilians -- and the pliosaurus, a creature which appears to have formed a link between the plesiosaurus and the crocodile.