(Simosaurus,(Cymatosaurus,(Pistosauridae,(Thalassiodracon,Plesiopterys,(Plesiosaurus,(((Muraenosaurus,Cryptoclidus),(Tricleidus,(Kimmerosaurus,Morturneria),((Edgarosaurus,Polycotylus),(Dolichorhynchops,Trinacromerum)))),(Microcleidus,(Brancasaurus,(Alzadasaurus,(Libonectes,Styxosaurus)))))),(Eurycleidus,(Attenborosaurus,((Yorkshire_longirostris,(Hauffiosaurus,(Kronosaurus,(Peloneustes,(Liopleurodon,(Pliosaurus,Brachauchenius)))))),(Umoonasaurus,((Macroplata,(Rhomaleosaurus_zetlandicus,(Simolestes,Leptocleidus))),(Rhomaleosaurus_megacephalus,Rhomaleosaurus_victor))))))))));