As we see with ZCA2, ECA2 & XCA2 these branches are compressed and do not extend as TCA does. Is there a technical term for this and what usually causes it?
The phenomenon where you have different "evolutionary clocks" of selection is called
heterotachy. The branches are therefore
heterotachic or simply
long branches —long branch attraction is a problem with Bayesian inference for which many arguments have been had, so there is a lot of literature on it.