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