A restoration of "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. "Microcephale" was first mentioned by paleontologist Paul Sereno in a 1997 paper on dinosaurian evolution. These skull caps measure less than 5 cm (2 in) each. No potential species name was given. A 2009 National Geographic documentary (Bizarre Dinosaurs) referred to "Microcephale" as "Mycocephale" (meaning "mushroom head").
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