镶嵌踝类主龙（Crurotarsi）是一个主龙类演化支，由保罗·塞里诺（Paul Sereno）在1991年创建，用来取代旧的伪鳄亚目。塞里诺在2005年作出更准确的种系发生学定义：亲缘关系较亲近于尼罗鳄，而离家麻雀较远的所有物种；也就是亲缘关系较亲近于鳄鱼，而离鸟类较远的所有物种。所以，镶嵌踝类主龙是鸟颈类主龙（亲缘关系较亲近于鸟类，而离鳄鱼较远）的姐妹演化支。与旧式的传统分类相比，镶嵌踝类主龙或多或少符合槽齿目去掉古鳄亚目，再加上鳄目。

Crurotarsi is a group of archosauriformes that includes the archosaurs (represented today by crocodilians and birds) and the extinct, crocodile-like phytosaurs. The name is derived from the Latin word crus and the Greek word tarsos; it refers to the specialized articulation between crus and tarsus—specifically between fibula and calcaneum—present in the skeletons of suchians and phytosaurs, with a hemicylindrical condyle on the calcaneum articulating against fibula.