We call ceratopsians with a nasal horn and these small frill bones ceratopsid ceratopsians.

我们称长有鼻角的角龙为角龙类，而这些带褶边的小骨头为角龙类。

The nasal horn is a synapomorphy or shared derived character of the ceratopsid clade.

鼻角是角龙类进化枝的突触形态或共有的衍生特征。