Tricleidus was a plesiosaur, a type of marine reptile. It was not a dinosaur, though it coexisted with many dinosaurs. Tricleidus lived during the Middle Jurassic.

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

Tricleidus was described by the following scientific paper(s):
  • C. W. Andrews. 1909. On some new Plesiosauria from the Oxford Clay of Peterborough. Annals And Magazine of Natural History 4:418-429
  • L.-D. Ginsberg and P. Janvier. 1976. Un nouveau gisement à Plésiosaures dans le Jurassique du Spitsbergen (Archipel du Svalbard) [A new locality with plesiosaurs in the Jurassic of Spitzbergen (Svalbard archipelago)]. Årbok Norsk Polarinstitutt 1974:262-265
  • R. Lydekker. 1889. Catalogue of the Fossil Reptilia and Amphibia, Part II. Containing the orders Ichthyopterygia and Sauropterygia. Taylor and Francis.