Classification of Storrs 1999

Or. †Plesiosauria de Blainville 1835 [plesiosaur]
show all
Invalid names: Piratosaurus plicatus Leidy 1865 [nomen dubium]
G. †Dolichorhynchops Williston 1902
show all
Dolichorhynchops osborni Williston 1902
G. †Ogmodirus Williston and Moodie 1913
show all
Invalid names: Ogmodirus martini Williston and Moodie 1917 [nomen dubium]
G. †Polycotylus Cope 1869
show all
hide
Invalid names: Polycotylus dolichopus Williston 1906 [synonym]
G. †Styxosaurus Welles 1943
show all
Styxosaurus snowii Williston 1890
Invalid names: Thalassonomosaurus marshii Williston 1906 [nomen dubium]
Fm. †Elasmosauridae Cope 1869 [elasmosaur]
show all
G. †Elasmosaurus Cope 1868
hide
G. †Hydralmosaurus Welles 1943
hide
hide
Invalid names: Styxosaurus browni Welles 1952 [synonym]
Invalid names: Alzadasaurus kansasensis Welles 1952 [nomen dubium], Elasmosaurus sternbergi Williston 1906 [nomen dubium], Plesiosaurus gulo Cope 1872 [nomen dubium], Thalassiosaurus ischiadicus Williston 1903 [nomen dubium], Thalassonomosaurus nobilis Williston 1906 [nomen dubium]