outgroup

In this, Erythrosuchids constitute an Archosauriformes clade that is an outgroup to the Archosauria proper.

依照这个方法，引鳄科构成一个初龙形动物演化支，是初龙的外。

What does group membership mean? How should we measure it? Ingroup vs. outgroup.

会员的意是什麽？我何衡量？圈内与圈外。