Microcephale

"Microcephale" (meaning "tiny head") is the informal name of a genus of very small pachycephalosaurid dinosaur, otherwise known as the "North American dwarf species", which lived during the Late Cretaceous. Its fossils were found in the late Campanian-age Dinosaur Park Formation, in Alberta, Canada. Not much is known about this dinosaur, as it has not yet been fully described; it is therefore a nomen nudum. The fossils of "Microcephale", including tiny skull caps, were first mentioned by paleontologist Paul Sereno in 1997, in a list of pachycephalosaurids. These skull caps measure less than 5 cm (2 in) each. No potential species name was given.

In a National Geographic documentary (Bizarre(Weird?) Dinosaurs) in 2009 a tiny(Cat size.) pachycephalosaurid was mentioned and called "Mycocephale" (meaning "mushroom head") this not a recognized genus has never been previously mentioned and could be the same animal as "Microcephale".