Wanneria_walcottanaElliptocephala_asaphoidesElliptocephala_sequomalusElliptocephala_mediocrisElliptocephala_walcottiElliptocephala_bicensisElliptocephala_laxoculesElliptocephala_paraoculusElliptocephala_parvifronsElliptocephala_loganiElliptocephala_mirabilisElliptocephala_lundgreniOsteologyMaximum ParsimonyBased on reanalysis of the original matrix.Lieberman_1999ac