TunicataCephalochordataMyxinoideaMyxinikelaPetromyzontidaMesomyzonPriscomyzonMayomyzonHaikouichthysHeterostraciAstraspisArandaspidaAnaspidaJamoytiusEuphaneropsOsteostraciGaleaspidaLoganelliaTuriniaJawedvertebratesEuconodontaOsteologyMaximum ParsimonyBased on reanalysis of the original matrix.Gess_etal_2006a