Named By: Edward Drinker Cope - 1874.
Classification: Chordata, Reptilia, Dinosauria, Ornithischia, Ornithopoda, Hadrosauridae.
Species: C. arctatus (type), C. stenopsis.
Size: Uncertain due to lack of remains.
Known locations: Canada, Alberta - Frenchman Formation. USA, Colorado - Laramie Formation.
Time period: Maastrichtian of the Cretaceous.
Fossil representation: Fragmentary remains.
Cionodon is a dubious genus of hadrosaur that is based only upon very partial and fragmentary remains. So far two species of Cionodon continue to exist, but because of the poor quality of their fossils, it is next to impossible to assigned further remains to them, or even to identify them as synonymous with other genera. One former species, Cionodon kysylkumensis, is now often included as a species of Bactrosaurus.
- On the transition beds of the Saskatchewan district. Proceedings of the Academy of Natural Sciences of Philadelphia 27:2-3. - Edward Drinker Cope - 1875.