Archaeonectrus_rostratusAristonectesparvidensAttenborosaurusconybearAugustasaurushagdorniBMNH_49202BrachaucheniuslucasiBrancasaurusbrancaiCallawayasauruscolombieCymatosaurusCryptocliduseurymerusDolichorhynchopsherscheDolichorhynchopsosborniEdgarosaurusmuddiElasmosaurus_platyurusEopolycotylusrankiniEromangasaurusaustralisEurycleidusarcuatusFHSMVP321BEDFM_1999_dot_201BMNH_R2349HauffiosauruszanoniHydrorionbrachypterygiuHydrotherosaurusalexandKaiwhekeakatikiKimmerosauruslanghamiKronosaurusqueenslandicLeptocleiduscapensisLeptocleidussuperstesLibonectesmorganiLiopleurodonferoxMacroplatalongirostrisMacroplatatenuicepsManemergusanguirostrisMaresauruscoccaiMicrocleidushomalospondMMUM_LL_8004MuraenosaurusleedsiiOccitanosaurustournemirOUMNH_J_dot_02247OUMNH_J_dot_10337OUMNH_J_dot_28585PalmulasaurusquadratusPeloneustesphilarchusPlesiopleurodonwellesiPlesiosaurusdolichodeirPlesiosaurusmacrocephalPliosaurusandrewsiPliosaurusbrachydeirusPliosaurusbrachyspondylPolycotyluslatipinnisQMF_18041RhomaleosaurusmegacephaRhomaleosaurusvictorRhomaleosauruszetlandicSeeleyosaurusguilelmiimSimolestesvoraxSimosaurusgaillardotiStyxosaurussnowiiTerminonatatorpontiexenThalassiodraconhawkinsiThalassomedonhaningtoniThililualongicollisNichollssauraTricleidusseeleyiTrinacromerumbentonianuUmoonasaurusdemoscyllusOsteologyMaximum ParsimonyBased on reanalysis of the original matrix.Ketchum_et_Benson_2010a