Classification of Knauss et al. 2011

Superfm. Kinosternoidea Hay 1892 [mud turtle]
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G. †Agomphus Cope 1871
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Agomphus pectoralis Cope 1870
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Invalid names: Agomphus masculinus Wieland 1905 [synonym], Agomphus tardus Wieland 1905 [synonym], Emys turgidus Cope 1870 [synonym]
Fm. Dermatemydidae Baur 1888
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G. †Baptemys Leidy 1870
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Baptemys garmanii Cope 1872
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Invalid names: Baptemys tricarinata Hay 1908 [synonym]
G. Dermatemys Gray 1847 [Central American river turtle]
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Dermatemys mawii Gray 1847 [Central American river turtle]
G. †Hoplochelys Hay 1908
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Hoplochelys clark Knauss et al. 2011
Hoplochelys crassa Cope 1888
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Invalid names: Hoplochelys bicarinata Hay 1910 [synonym], Hoplochelys elongata Gilmore 1919 [synonym], Hoplochelys laqueata Gilmore 1919 [synonym], Hoplochelys paludosa Hay 1908 [synonym], Hoplochelys saliens Hay 1908 [synonym]
Unr. Testudines Batsch 1788 [turtle]
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Unr. Cryptodira Cope 1868
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Unr. Chelydroidea Baur 1893
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Fm. Chelydridae Swainson 1839
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G. Chelydra Schweigger 1812 [Snapping turtle]
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Chelydra serpentina Linnaeus 1758 [Common snapping turtle]
G. †Emarginachelys Whetstone 1978
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Emarginachelys cretacea Whetstone 1978
G. Macrochelys Gray 1856 [alligator snapping turtle]
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Macrochelys temminckii Troost 1835 [Alligator snapping turtle]
Unr. Kinosternoidea Hay 1892 [mud turtle]