Stegoceras validus Lambe, 1902 Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Animalia phylum Chordata family Pachycephalosauridae genus Stegoceras species Stegoceras validus Name Synonyms Ornatotholus browni (Wall & Galton, 1979) Stegoceras browni (Wall & Galton, 1979) Troodon validus (Lambe, 1902) Homonyms Stegoceras validus Lambe, 1902