(Cymatosaurus,(OUMJ28585,(Yunguisaurus,(Pistosaurus,(Augustasaurus,(Attenborosaurus,((BMNH_49202,(Plesiosaurus_longirostris,((Archaeonectrus,((Macroplata,(WARMS_G10875,((Eurycleidus,Rhomaleosaurus_megacephalus),(NMING_F10194,(NIMING_F8749,LEICS_G221_1851))))),(Sthenarosaurus,(Rhomaleosaurus_victor,(Maresaurus,((Rhomaleosaurus_cramptoni,Rhomaleosaurus_thorntoni),(Rhomaleosaurus_propinquus,Rhomaleosaurus_zetlandicus))))))),(Hauffiosaurus,(Leptocleidus_clemai,(((Brachauchenius,Kronosaurus),(Simolestes,(Liopleurodon,(Peloneustes,Pliosaurus)))),((Dolichorhynchops,(Umoonasaurus_demoscyllus,Nichollssaura_borealis)),(Leptocleidus_capensis,Leptocleidus_superstes)))))))),(Thalassiodracon,(Plesiosaurus_dolichodeirus,(Hydrorion,Seeleysaurus))))))))));