From a detailed analysis of the salamanders' family tree, however, it is clear that the other lineages evolved from an ancestor that itself had lost the ability to metamorphose.

然而，通过对蝾螈族谱的详细分析，我们可以清楚地看到，其他谱系分支是从一个本身已经失去了变形的能力的祖先演化而来的。