Classification of Hutchison 1996

Superfm. Kinosternidae Hay 1892 [mud turtle]
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G. †Xenochelys Hay 1906
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†Xenochelys formosa Hay 1906
Fm. Carettochelyidae Gill 1889
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Subfm. †Anosteirinae Lydekker 1889
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G. †Anosteira Leidy 1871
G. †Pseudanosteira Clark 1932
Fm. Trionychidae Gray 1825 [softshell turtle]
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Subfm. Trionychinae Gray 1825 [softshell turtle]
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Tr. Trionychini Gray 1825
Fm. Emydidae Rafinesque 1815
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G. Chrysemys Gray 1844 [painted turtle]
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†Chrysemys antiqua Clark 1937
†Chrysemys timida Hay 1908
G. †Pseudograptemys Hutchison 1996
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†Pseudograptemys inornata Loomis 1904
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Invalid names: Graptemys cordifera Clark 1937 [synonym]
Fm. Testudinidae Batsch 1788
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G. Gopherus Rafinesque 1832 [gopher tortoise]
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Subg. †Gopherus (Gopherus) Rafinesque 1832
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Gopherus (Gopherus) polyphemus Daudin 1802 [Florida gopher tortoise]
Subg. †Gopherus (Oligopherus) Hutchison 1996
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Invalid names: Testudo praeextans Lambe 1913 [synonym], Testudo quadratus Cope 1884 [synonym], Testudo thomsoni Hay 1908 [synonym]
Invalid names: Bysmachelys Johnston 1937 [synonym]
G. †Hesperotestudo Williams 1950
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G. †Stylemys Leidy 1851
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†Stylemys amphithorax Cope 1873
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Invalid names: Testudo ligonius Cope 1873 [synonym]
†Stylemys nebrascensis Leidy 1851
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Invalid names: Emys culbertsonii Leidy 1852 [synonym], Emys hemispherica Leidy 1851 [synonym], Emys oweni Leidy 1851 [synonym], Testudo lata Leidy 1851 [synonym]
Invalid names: Testudo cultrata Cope 1873 [nomen dubium], Testudo exornata Lambe 1906 [nomen dubium]
Fm. Bataguridae Gray 1870
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G. †Echmatemys Hay 1906
Tr. †Ptychogastrini De Stefano 1903
Subtr. Apalonina Meylan 1987 [softshell turtle]
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G. Apalone Rafinesque 1832 [softshell turtle]
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Subg. Apalone (Platypeltis) Fitzinger 1835
†Apalone amnicola Hay 1907
†Apalone extensa Hay 1908
†Apalone heteroglypta Cope 1873
†Apalone leucopotamica Cope 1891
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Invalid names: Trionyx punctiger Cope 1891 [synonym]
†Apalone postera Hay 1908
†Apalone trionychoides Cope 1872
Invalid names: Plastomenus serialis Cope 1877 [nomen dubium], Platypeltis antiqua Hay 1907 [nomen dubium], Platypeltis trepida Hay 1907 [nomen dubium]