Colymbosaurus was a species of marine reptile known as a plesiosaur, not to be confused with pliosaurs, they are easily distinguished from each other as plesiosaurs were known to have elongated necks. This species existed in the Jurassic period, the fossils being found in Kimmerdgian clay beds, dating them to 157 to 152 millions years old. They grew up to 5 meters in length, and had long necks, it is believed that the necks enabled them to snatch fish from schools whilst keeping their bulky bodies away and out of sight. This particular specimen is a great example of preserved vertebra displaying concave shape and rough outer texture with an earthy brown colouration. Found in the Kimmeridgian clay formations of Abingdon, Oxfordshire, UK. Measuring 9 x 9 x 6 cm in size and weighs 722 grams. it comes supplied with a white card tray and information label.