Classification of Serratos et al. 2017

Diapsida Osborn 1903 [diapsid]
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Sauropterygia Owen 1861
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Plesiosauria de Blainville 1835 [plesiosaur]
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Xenopsaria Benson and Druckenmiller 2014
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Fm. †Elasmosauridae Cope 1869 [elasmosaur]
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Subfm. †Styxosaurinae Otero 2016
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G. †Nakonanectes Serratos et al. 2017
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Nakonanectes bradti Serratos et al. 2017