The value of updating GenBank accessions for supermatrix phylogeny: The case of the New Guinean marsupial carnivore genus Myoictis

•Taxonomic misattribution of GenBank accessions misleads Myoictis phylogeny.•A few misattributed accessions disproportionately mislead supermatrix phylogeny.•Updating these accessions corrects Myoictis supermatix phylogeny.•Myoictis melas is sister to all other Myoictis species.•We propose a model for flagging anomalous GenBank accessions.