By José Carlos Cortés on @ryuukibart
Name: Diclonius pentagonus
Name Meaning: Double Sprout
First Described: 1876
Described By: Cope
Classification: Dinosauria, Ornithischia, Genasauria, Neornithischia, Cerapoda, Ornithopoda, Iguanodontia, Dryomorpha, Ankylopollexia, Styracosterna, Hadrosauriformes, Hadrosauroidea, Hadrosauridae
Diclonius is a Hadrosaur described by Cope, so it is predictably dubious and poorly known. It was found in the Judith River Formation in Montana, dating back to about 75 million years ago in the Campanian age of the Late Cretaceous. It is based only on teeth, with its name in a reference to the fact that newly erupting teeth were used alongside older teeth. Since it is based on only a single tooth specimen, very little more can be said about it, other than the fact that it was a hadrosaur. Thanks, Cope.
Shout out goes to @pumpkinhead1988!