Eretmosaurus was a plesiosaur, a type of marine reptile. It was not a dinosaur, though it coexisted with many dinosaurs.
All these Eretmosaurus pictures were collected from the internet. Enjoy and explore:
- R. Owen. 1865. A monograph of the fossil Reptilia of the Liassic formations. Part I, Sauropterygia. Palaeontographical Soceity Monographs 17(75):1-40