outgroup
Aigialosaurus_dalmaticus
Dallas_aigialosaur
Aigialosaurus_buccichi
Carsosaurus_marchesetti
Taxon_Novum
Halisaurus_sternbergi
Halisaurus_cf_sternbergi
Halisaurus_n_sp
Halisaurus_platyspondylus
Tylosaurus_n_sp
Ectenosaurus_clidastoides
Platecarpus_planifrons
Clidastes_n_sp
Mosasaurus_missouriensis