Opinions from K. Carpenter 1999

  • 'Alzadasaurus is a subjective synonym of Thalassomedon'
  • 'Alzadasaurus colombiensis is recombined as Callawayasaurus colombiensis'
  • 'Alzadasaurus kansasensis belongs to Alzadasaurus' according to Welles 1952
  • 'Alzadasaurus kansasensis is a subjective synonym of Styxosaurus snowii'
  • 'Alzadasaurus pembertoni is a subjective synonym of Styxosaurus snowii'
  • 'Alzadasaurus riggsi is a subjective synonym of Thalassomedon hanningtoni'
  • 'Brancasaurus belongs to Elasmosauridae'
  • 'Callawayasaurus belongs to Elasmosauridae'
  • 'Cimoliosaurus snowii is recombined as Styxosaurus snowii'
  • 'Cimoliosaurus snowii is recombined as Cimoliasaurus snowii' according to Williston 1890
  • 'Cryptoclididae belongs to Plesiosauria'
  • 'Elasmosauridae belongs to Plesiosauroidea'
  • 'Elasmosaurus belongs to Elasmosauridae'
  • 'Thalassonomosaurus marshi is a subjective synonym of Styxosaurus snowii'
  • 'Elasmosaurus marshii is recombined as Thalassonomosaurus marshi' according to Welles 1943
  • 'Elasmosaurus morgani is recombined as Libonectes morgani'
  • 'Elasmosaurus platyurus belongs to Elasmosaurus'
  • 'Elasmosaurus serpentinus belongs to Elasmosaurus' according to Riggs 1939
  • 'Elasmosaurus serpentinus is recombined as Hydralmosaurus serpentinus'
  • 'Hydralmosaurus belongs to Elasmosauridae'
  • 'Hydrotherosaurus belongs to Elasmosauridae'
  • 'Libonectes belongs to Elasmosauridae'
  • 'Microcleidus belongs to Elasmosauridae'
  • 'Morenosaurus stocki belongs to Morenosaurus'
  • 'Muraenosaurus belongs to Plesiosauroidea'
  • 'Plesiopleurodon belongs to Pliosauridae'
  • 'Plesiosauridae belongs to Plesiosauroidea'
  • 'Plesiosauroidea belongs to Plesiosauria'
  • 'Polycotylus ischiadicus is recombined as Thalassiosaurus ischiadicus' according to Welles 1943
  • 'Thalassiosaurus ischiadicus is a subjective synonym of Styxosaurus snowii'
  • 'Styxosaurus belongs to Elasmosauridae'
  • 'Styxosaurus browni is a subjective synonym of Hydralmosaurus serpentinus'
  • 'Styxosaurus browni belongs to Styxosaurus' according to Welles 1952
  • 'Thalassiosaurus is a subjective synonym of Styxosaurus'
  • 'Thalassomedon belongs to Elasmosauridae'
  • 'Thalassomedon hanningtoni belongs to Thalassomedon'
  • 'Thalassonomosaurus is a subjective synonym of Styxosaurus'
  • 'Tuarangisaurus belongs to Elasmosauridae'
  • 'Tuarangisaurus keyesi belongs to Tuarangisaurus'