What the naturalists did not realize was that Plesiosaurus was not an intermediate form between crocodiles and ichthyosaurs, after all, but a unique and starkly different sort of marine reptile.

WASHINGTON - The remains of a giant sea creature are providing the first proof that these prehistoric reptiles gave birth to their young rather than laying eggs. Plesiosaurs, which lived at the time ...

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Scientists have pieced together the first-ever fossil of a pregnant plesiosaur, a giant Mesozoic sea reptile from the Cretaceous Era, with an embryo still inside. The animal, which roamed the seas ...

The fossil bones of a giant, long-necked swimming reptile from the age of the dinosaurs have resolved a long-held mystery about the animals and how they reproduced. Those denizens of ancient seas - ...

This article was published in Scientific American’s former blog network and reflects the views of the author, not necessarily those of Scientific American Between the later part of the Triassic and ...

Remaining in the ground for 165 million years, an ancient marine reptile has been excavated from a quarry in eastern England. The fossils belong to what is suspected to be a new species of plesiosaur, ...

The plesiosaur is long extinct, but thanks to a biomechanical engineer, it has been reincarnated -- as a robot. This new so-called "robosaur" reveals the secret behind the animal's odd but powerful ...

A newly described plesiosaur fossil from southern Germany is providing crucial evidence about the diversification of these ancient marine reptiles during the Early Jurassic. Published in PeerJ, the ...

The opening sentence of F. Robin O’Keefe and Luis Chiappe’s new paper in Science this week is a simple statement of fact that threw me for a loop. “Viviparity, or birthing live young,” the ...

The inflexibility of the plesiosaur neck makes these creatures all the more puzzling. If they were incapable of raising their heads above the water to ambush prey from above and lacked the flexibility ...