SimosaurusCymatosaurusPistosauridaeCalawayasaurusAttenborosaurusBMNH_R_dot_5488BrachaucheniusBrancasaurusCryptoclidusDolichorhynchopsEurycleidusHauffiosaurusKimmerosaurusKronosaurusLeptocleidusLibonectesLiopleurodonMacroplataMicrocleidusMOR_751MorturneriaMuraenosaurusPeloneustesPlesiosaurusPliosaurusPolycotylusRhomaleosaurus_megacephalusRhomaleosaurus_victorRhomaleosaurus_zetlandicusSimolestesStyxosaurusThalassiodraconTricleidusTrinacromerumOsteologyMaximum ParsimonyBased on reanalysis of the original matrix.OKeefe_2001a