(A) Delimited species being assumed to be monophyletic units, the set of alternative partitionings is consequently containing the minimal phylogenetic signal required to perform indexes calculation. (B) In practice, non-monophyletic inferred species are nevertheless not rare. In such a case, the non-monophyletic partition will nevertheless be assumed to form a monophyletic unit. Speciation nodes involved in the resulting incongruent topologies will therefore be treated as distinct and antagonist potential events (node 2 versus 2’).
