Cryptocleidus was a plesiosaur, a type of marine reptile. It was not a dinosaur, though it coexisted with many dinosaurs. The first Cryptocleidus fossil was discovered in 1892.

All the Cryptocleidus illustrations below were collected from the internet. Enjoy and explore:

Cryptocleidus was described by the following scientific paper(s):
  • D. Martill. 1984. The occurrence of a dinosaurian phalanx in the Lower Oxford Clay of Peterborough, Cambridge. Mercian Geologist 9(4):209-211
  • H.-E. Sauvage. 1874. Mémoire sur les dinosauriens et les crocodiliens des terrains jurassiques de Boulogne-sur-Mer [Memoir on the dinosaurs and crocodilians of the Jurassic deposits of Boulogne-sur-mer]. Mémoires de la Société Géologique de France, série 2 10(2):1-57
  • D. S. Brown. 1981. The English Upper Jurassic Plesiosauroidea (Reptilia) and a review of the phylogeny and classification of the Plesiosauria. Bulletin of the British Museum (Natural History) 35(4):253-347