角龙亚目是由奥塞内尔·查利斯·马什(Othniel Charles Marsh)在1890年所建立,用来包含有特定特征的恐龙,例如:角状物、喙骨、两排牙齿、愈合的颈部脊椎骨、以及往前指的骨盆。马什认为角龙类有足够特点,可在鸟臀目内建立自己的亚目[6]。Ceratopsia在希腊文里,"keras"意为角,"opsis"意为面孔。在1960年代,有人提出Ceratopsia在语法上是不正确的,应该是Ceratopia[7]。然而,后者在科学文献中很少见,大部分科学家还是使用Ceratopsia。国际动物命名法委员会并不对超科以上的分类单元名称有要求、规定,因此不需更改。
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