Classification of Otero et al. 2014

Unr. Diapsida Osborn 1903 [diapsid]
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Unr. †Sauropterygia Owen 1859
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Unr. †Plesiosauria de Blainville 1835 [plesiosaur]
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Fm. †Elasmosauridae Cope 1869 [elasmosaur]
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Unr. †Aristonectinae Otero et al. 2012
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G. †Aristonectes Cabrera 1941
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†Aristonectes quiriquiensis Otero et al. 2014