Classification of Williston 1908
Or. †Plesiosauria de Blainville 1835 [plesiosaur]
show all | hide all
Fm. †Polycotylidae Williston 1908
hide
G. †Polycotylus Cope 1869
hide
†Polycotylus dolichopus Williston 1906
†Polycotylus latipinnis Cope 1869
G. †Trinacromerum Cragin 1888
hide
†Trinacromerum anonymum Williston 1903
†Trinacromerum bentonianum Cragin 1888
†Trinacromerum latimanus Williston 1908
Invalid names: Dolichorhynchops Williston 1902 [synonym]