Plesiosaurs, erroneously viewed as dinosaurs, inhabited all Earth’s oceans between 200 million and 65 million years ago. In the Peninsula, only scarce remains of these long-necked reptiles had been found. Now, a group of palaeontologists has found the most abundant collection of fossils in Morella, Castellón. Among them, there is one vertebra that belonged to a type of plesiosaur never before discovered in the country, the leptocleidus.