Classification of the family Protostegidae
Fm. †Protostegidae Cope 1873
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G. †Desmatochelys Williston 1894
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†Desmatochelys lowii Williston 1894
†Desmatochelys padillai Cadena and Parham 2015
G. †Notochelone Lydekker 1889
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†Notochelone costata Owen 1882
Invalid names: Notochelys Owen 1882 [replaced]
G. †Protostega Cope 1871
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†Protostega eaglefordensis Zangerl 1953
†Protostega gigas Cope 1871
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Invalid names: Protostega dixie Zangerl 1953 [synonym], Protostega potens Hay 1908 [synonym]
Subfm. †Protosteginae Wieland
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G. †Rhinochelys Seeley 1869
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†Rhinochelys amaberti Moret 1935
†Rhinochelys cantabrigiensis Lydekker 1889
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Invalid names: Rhinochelys cardiocephalus Seeley 1869 [synonym], Rhinochelys dayi Seeley 1869 [synonym], Rhinochelys eurycephalus Seeley 1869 [synonym], Rhinochelys jessoni Lydekker 1889 [synonym], Rhinochelys platyrhinus Seeley 1869 [synonym], Rhinochelys rheporhinus Seeley 1869 [synonym], Rhinochelys sphenicephalus Seeley 1869 [synonym]
†Rhinochelys elegans Lydekker 1889
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Invalid names: Rhinochelys brachyrhina Lydekker 1889 [synonym], Rhinochelys macrorhina Lydekker 1889 [synonym], Rhinochelys mastocephalus Seeley 1869 [synonym], Rhinochelys stenicephalus Seeley 1869 [synonym]
†Rhinochelys nammourensis Tong et al. 2006
G. †Terlinguachelys Lehman and Tomlinson 2004
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†Terlinguachelys fischbecki Lehman and Tomlinson 2004