(Simosaurus,(Cymatosaurus,(Pistosauridae,((Plesiopterys,(Plesiosaurus,(Microcleidus,(((Muraenosaurus,Cryptocleidus),((Tricleidus,((Edgarosaurus_MOR_751,Polycotylus),(Dolichorhynchops,Trinacromerum))),(Kimmerosaurus,Morturneria))),(Brancasaurus,(Callawayasaurus_was_Alzadasaurus,(Libonectes,Styxosaurus))))))),(Thalassiodracon,((Eurycleidus,Attenborosaurus),(((Rhomaleosaurus_megacephalus,(Rhomaleosaurus_victor,(Yorkshire_taxon_BMNH_R_dot_5488,(Rhomaleosaurus_zetlandicus,Simolestes)))),(Macroplata,(Hauffiosaurus,(Kronosaurus,(Peloneustes,(Liopleurodon,(Pliosaurus,Brachauchenius))))))),((Leptocleidus_superstes,Leptocleidus_capensis),(Nichollssaura_borealis,(Leptocleidus_clemai,Umoonasaurus_demoscyllus))))))))));