BoreosomusBirgeriaChondrosteusPeipiaosteusPolyodonProtopsephurusPsammorhynchusHuso_husoScaphirhynchusPseudoscaphirhynchus_kauffmaniPseudoscaphirhynchus_hermanniAcipenser_brevirostrumAcipenser_stellatusAcipenser_ruthenusAcipenser_fulvescensAcipenser_oxyrinchusAcipenser_transmontanusAcipenser_baeriOsteologyMaximum ParsimonyBased on reanalysis of the original matrix.Hilton_et_Forey_2009a