And, among the ankylosaurids, only a small, derived subset, the ankylosaurines, had them.

而且，在甲龙科中，只有一小部分衍生的甲龙亚科有它们。

Now, the ankylosaur family tree can be split into two main groups, the ankylosaurids and the nodosaurids.

现在， 甲龙科可以分为两大类，甲龙科和结节龙科。