Classification of Bell Jr. et al. 2013

Or. Squamata Oppel 1811 [squamates]
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Superfm. †Mosasauroidea
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Fm. †Mosasauridae Gervais 1852 [mosasaur]
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Subfm. †Mosasaurinae Gervais 1853
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G. †Clidastes Cope 1868
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†Clidastes liodontus Merriam 1894
Subfm. †Plioplatecarpinae Dollo 1884
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G. †Ectenosaurus Russell 1967
G. †Platecarpus Cope 1869
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Unr. †Russellosaurina Bell 1997
Subfm. †Tylosaurinae Wiliston 1895
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G. †Tylosaurus Marsh 1872
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†Tylosaurus kansasensis Everhart 2005