SimosaurusCymatosaurusPistosauridaePlesiosaurusThalassiodraconAttenborosaurusYorkshire_longirostrisHauffiosaurusPeloneustesPliosaurusLiopleurodonBrachaucheniusKronosaurusMuraenosaurusCryptoclidusTricleidusKimmerosaurusMorturneriaEdgarosaurusPolycotylusDolichorhynchopsTrinacromerumMicrocleidusBrancasaurusAlzadasaurusLibonectesStyxosaurusRhomaleosaurus_zetlandicusRhomaleosaurus_megacephalusRhomaleosaurus_victorSimolestesLeptocleidusMacroplataPlesiopterysEurycleidusUmoonasaurusOsteologyMaximum ParsimonyBased on reanalysis of the original matrix.Kear_etal_2006a