是厚头龙科厚头龙科成员,并且是倾头龙和高顶龙所形成演化支的姐妹群。系统发育分析结果如以下分支图所示: Horner, JohnR.; Goodwin, Mark B.; Evans, David C. A new pachycephalosaurid from the Hell Creek Formation
PMID 9017382. Ganetzky, B. The 1997 Thomas Hunt Morgan Medal. Oliver Evans Nelson, Jr. Genetics. 1998, 148 (1): 1–2. PMC 1459803 . PMID 9475714. Silver
1954 Arthur Francis Buddington 1953 Esper S. Larsen, Jr. 1952 喬治·蓋洛德·辛普森 1951 彭蒂·埃斯科拉 1950 Morley Evans Wilson 1949 Wendell P. Woodring 1948 Hans Cloos 1947