Opinions from S. W. Williston 1903

  • 'Brachauchenius belongs to Pliosauridae'
  • 'Brimosaurus belongs to Plesiosauria'
  • 'Brimosaurus grandis belongs to Brimosaurus'
  • 'Cimoliasaurus belongs to Plesiosauria'
  • 'Cimoliasaurus laramiensis belongs to Cimoliasaurus'
  • 'Cimoliosaurus magnus is recombined as Cimoliasaurus magnus'
  • 'Cimoliosaurus snowii is recombined as Cimoliasaurus snowii'
  • 'Discosaurus is a subjective synonym of Cimoliasaurus'
  • 'Discosaurus planior is recombined as Cimoliasaurus planior'
  • 'Discosaurus vetustus is recombined as Cimoliasaurus vetustus'
  • 'Dolichorhynchops belongs to Plesiosauria'
  • 'Dolichorhynchops osborni belongs to Dolichorhynchops'
  • 'Elasmosaurus belongs to Plesiosauria'
  • 'Elasmosaurus intermedius belongs to Elasmosaurus'
  • 'Elasmosaurus orientalis belongs to Elasmosaurus'
  • 'Elasmosaurus platyurus belongs to Elasmosaurus'
  • 'Elasmosaurus serpentinus belongs to Elasmosaurus'
  • 'Embaphias belongs to Plesiosauria'
  • 'Embaphias circulosus belongs to Embaphias'
  • 'Megalneusaurus belongs to Plesiosauria'
  • 'Nothosaurops belongs to Plesiosauria'
  • 'Nothosaurops occiduus belongs to Nothosaurops'
  • 'Oligosimus belongs to Plesiosauria'
  • 'Oligosimus grandaevus belongs to Oligosimus'
  • 'Orophosaurus belongs to Plesiosauria'
  • 'Orophosaurus pauciporus belongs to Orophosaurus'
  • 'Pantosaurus belongs to Plesiosauria'
  • 'Parasaurus striatus is recombined as Pantosaurus striatus'
  • 'Piptomerus belongs to Plesiosauria'
  • 'Piptomerus hexagonus belongs to Piptomerus'
  • 'Piptomerus megaloporus belongs to Piptomerus'
  • 'Piptomerus microporus belongs to Piptomerus'
  • 'Piratosaurus belongs to Plesiosauria'
  • 'Piratosaurus plicatus belongs to Piratosaurus'
  • 'Plesiosaurus belongs to Plesiosauria'
  • 'Plesiosaurus brevifemur belongs to Plesiosaurus'
  • 'Plesiosaurus gouldii belongs to Plesiosaurus'
  • 'Plesiosaurus gulo belongs to Plesiosaurus'
  • 'Plesiosaurus lockwoodii is recombined as Taphrosaurus lockwoodii'
  • 'Plesiosaurus mudgei belongs to Plesiosaurus'
  • 'Plesiosaurus shirleyensis belongs to Plesiosaurus' according to Knight 1900
  • 'Pliosauridae belongs to Plesiosauria'
  • 'Polycotylus belongs to Plesiosauria'
  • 'Polycotylus ischiadicus belongs to Polycotylus'
  • 'Polycotylus latipinnis belongs to Polycotylus'
  • 'Taphrosaurus belongs to Plesiosauria'
  • 'Trinacromerum belongs to Plesiosauria'
  • 'Trinacromerum bentonianum belongs to Trinacromerum'
  • 'Uronautes belongs to Plesiosauria'
  • 'Uronautes cetiformis belongs to Uronautes'