Classification of Williston 1908

Or. †Plesiosauria de Blainville 1835 [plesiosaur]
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Fm. †Polycotylidae Williston 1908
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G. †Piratosaurus Leidy 1865
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Piratosaurus plicatus Leidy 1865
G. †Polycotylus Cope 1869
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Polycotylus dolichopus Williston 1906
G. †Trinacromerum Cragin 1888
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Trinacromerum anonymum Williston 1903
Trinacromerum latimanus Williston 1908
Invalid names: Dolichorhynchops Williston 1902 [synonym]