Plesiosaurus (Greek: πλησίος (plesios), near to + σαῦρος (sauros), lizard) is a genus of extinct, large marine sauropterygian reptile that lived during the Early Jurassic.

Plesiosaurus, an early plesiosaur, was about 4.5 metres (15 feet) long, with a broad, flat body and a relatively short tail. It swam by flapping its fins in the water, much as sea lions do today, in a modified …

May 5, 2025 · An in-depth profile of Plesiosaurus, including this marine reptile's characteristics, behavior, and habitat.

Plesiosaurus is an extinct marine reptile which lived approximately 135 million to 120 million years ago – from the Early to the Middle Jurassic Period. It was first discovered in the winter of 1823 by fossil …

Oct 19, 2023 · While dinosaurs roamed the Earth, marine reptiles in the order Plesiosauria swam in our planet's prehistoric oceans. Find out which creatures belonged in this group, how they grew to …

Discover the fascinating world of plesiosaurs also known as clade Plesiosauria. Explore long-necked marine reptiles facts & pictures from their ocean habitats.

Plesiosaurs (Greek: plesios meaning "near" or "close to" and sauros meaning "lizard") were carnivorous, aquatic (mostly marine) reptiles that lived from the Triassic to the Cretaceous periods. They were the …

May 27, 2024 · This skeleton of a Plesiosaurus shows its incredibly long neck. ©Lefteris Papaulakis/Shutterstock.com Habitat – When and Where It Lived Plesiosaurs were found in oceans …

Aug 29, 2025 · ‬Later study of Plesiosaurus fossils would reveal that many of these remains actually represented completely different plesiosaurs.‭ ‬New plesiosaur genera created from the re …

Its etymology referred to the earlier Plesiosaurus dolichodeirus as it is derived from πλεῖος, pleios, "more fully", reflecting that according to Owen it was closer to the Sauria than Plesiosaurus.