We sequence mitogenomes from three extinct and one living acanthisittid.
Stout-legged wrens (Pachyplichas) evolved recently from a gracile, flighted ancestor.
We confirm that the Miocene Kuiornis indicator is a crown-group acanthisittid.
Acanthisittids may have survived the “Oligocene drowning” of New Zealand in situ.
We revise acanthisittid taxonomy.