Classification of O'Gorman et al. 2018

Superor. †Sauropterygia Owen 1861
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Or. †Plesiosauria de Blainville 1835 [plesiosaur]
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Fm. †Elasmosauridae Cope 1869 [elasmosaur]
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Weddellonectia O'Gorman and Coria 2016