OUTGROUPAigialosaurus_dalmaticusDallasaurus_turneriOpetiosaurus_buccichiTrieste_aigialosaurClidastes_KUliodontusClidastes_YPliodontusClidastes_moorevillensisClidastes_novum_spClidastes_propythonEctenosaurs_clidastoidesEctenosaurus_YPcompositeGlobidens_alabamaensisGlobidens_dakotensisHalisaurus_novum_spHalisaurus_platyspondylusHalisaurus_sternbergiHalisaurus_cfsternbergiMosasasaurus_conodonMosasaurus_indetMosasaurus_maximusMosasaurus_missouriensisPlatecarpus_planifronsPlatecarpus_8769tympaniticusPlatecarpus_600tympaniticusPlesiotylosaurus_crassidensPlioplatecarpus_AMNH_spPlioplatecarpus_RMM_spPlotosaurus_bensoniPlotosaurus_tuckeriPrognathodon_overtoniPrognathodon_rapaxTylosaurus_nepaeolicusTylosaurus_novum_spTylosaurus_prorigerTaxon_novum_YMPYaguarasaurus_columbianusRussellosaurus_coheniAngolasaurus_bocageiTethysaurus_nopcsaiHaasiasaurus_gittelmaniOsteologyMaximum ParsimonyBased on reanalysis of the original matrix.Bell_et_Polcyn_2005a