Ancient reptile mystery solved as two extinct species found to be the same

Ichthyosaurs, which are similar-shaped to dolphins and sharks, but are reptiles, swam the seas for millions of years during the Triassic, Jurassic and Cretaceous periods. They were the first, large extinct reptiles brought to the attention of the scientific world.
Strange & Offbeat: Fossils & Ruins News — ScienceDaily