Classification of Hutchison and Holroyd 2003

Unr. Eucryptodira Gaffney 1975
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Fm. †Nanhsiungchelyidae Yeh 1966
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G. †Basilemys Hay 1902
Fm. Trionychidae Gray 1825 [softshell turtle]
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Subfm. †Plastomeninae Hay 1902
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G. †Helopanoplia Hay 1908
Subfm. Trionychinae Gray 1825 [softshell turtle]
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G. †Aspideretoides Gardner et al. 1995
G. †Axestemys Hay 1899
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Axestemys quinni Schmidt 1945
Invalid names: Polycryptodira Gaffney and Meylan 1988 [empty]
Unr. Cryptodira Cope 1868
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Fm. †Adocidae Cope 1869
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G. †Adocus Cope 1868
Fm. Chelydridae Swainson 1839
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G. †Denverus Hutchison and Holroyd 2003
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Denverus middletoni Hutchison and Holroyd 2003
Invalid names: Kinosternia Gaffney and Meylan 1988 [empty]
Or. Chelonii Latreille 1800 [turtle]
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Subor. Cryptodira Cope 1868
Invalid names: Cryptodiramorpha Lee 1995 [empty]