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You write "These trees differed only in the relative placement of five enantiornithines closely related to the Avisauridae forming a polytomy with this clade in the strict consensus tree (Consistency Index = 0.453; Retention Index = 0.650)". Given the CI/RI, this is either a "soft" polytomy – note that one instable taxon suffices to collapse the relevant nodes of a strict consensus tree, see e.g....

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