P. dolichodeirus, or Plesiosaurus, was not a dinosaur, but a plesiosaur—a marine reptile (Greek—near to lizard) from the Mesozoic Era of the Early Jurassic period.   Plesiosaurus was the first species of its kind to be discovered. Though much has been learned about its anatomy and evolution, there are still many topics of debate over the species. Some of the debates surrounding … [Read more...]