A New Leptoceratopsid (Ornithischia: Ceratopsia) from the Upper Cretaceous of Shandong China and Its Implications for Neoceratopsian Evolution

摘要

BackgroundThe ceratopsians represent one of the last dinosaurian radiations. Traditionally the only universally accepted speciose clade within the group was the Ceratopsidae. However, recent discoveries and phylogenetic analyses have led to the recognition of a new speciose clade, the Leptoceratopsidae, which is predominantly known from the Upper Cretaceous of North America.