SimosaurusCymatosaurusPistosauridaeMuraenosaurusCryptocleidusTricleidusKimmerosaurusMorturneriaEdgarosaurus_MOR_751PolycotylusDolichorhynchopsTrinacromerumLibonectesStyxosaurusCallawayasaurus_was_AlzadasaurusBrancasaurusMicrocleidusPlesiosaurusPlesiopterysThalassiodraconEurycleidusAttenborosaurusYorkshire_taxon_BMNH_R_dot_5488HauffiosaurusKronosaurusPeloneustesLiopleurodonPliosaurusBrachaucheniusRhomaleosaurus_megacephalusRhomaleosaurus_victorMacroplataRhomaleosaurus_zetlandicusSimolestesLeptocleidus_superstesLeptocleidus_capensisLeptocleidus_clemaiUmoonasaurus_demoscyllusNichollssaura_borealisOsteologyMaximum ParsimonyBased on reanalysis of the original matrix.Kear_et_Barrett_2011aa