They seem to have come from some very primitive mammal near the base of Laurasiatheria that also gave rise to one or more of the other groups in the superorder.

它们似乎来自 Laurasiatheria 基部附近的一些非常原始的哺乳动物，这些哺乳动物也产生了超目中的一个或多个其他类群。