After Meylan & Ganko, 1988 [from Meylan & Ganko, 1997 and Meylan, 2001], and Meylan, Moody, Walker & Chapman, 2000

<==o Trionychoidea sensu Meylan et al., 2000 (pehmeäkilpikonnansukuiset kilpikonnat)
   |?- †Hoplochelys
   |?- †Peltochelys duchastelii Doll, 1885
   |-- †Adocidae Cope, 1870 [incl. Nanshiungchelyidae Yeh, 1966]
   `--+-- †Emarginachelys
      `--+--o Dermatemydidae (tabaskokilpikonnat)
         |  |-- Dermatemys mawi (tabaskokilpikonna)
         |  `--o †Baptemys Leidy, 1870
         |     |-- †B. garmani
         |     `-- †B. wyomingensis
         `--+--o Kinosternidae ("valeliejukilpikonnat")
            |  |--o †Aspideretes Yeh, 1965
            |  |  |-- †A. maortuensis Yeh, 1965
            |  |  |-- †A. alashanensis
            |  |  |-- †A. foveatus Yeh, 1965
            |  |  `-- †A. alleni Yeh, 1965
            |  |?- Staurotypinae [see Chelydridae for alternative position]
            |  `-- Kinosterninae
            `--+-- †Sandownia harrisi Meylan et al., 2000
               `--+--o Carettochelyidae Boulenger, 1887 (flynkilpikonnat)
                  |  |?- †Sinaspideretes wimani Young & Chow, 1953 [Sinaspideretidae Ckhikvadze, 1987]
                  |  |--o †Anosteirinae Lydekker, 1889
                  |  |  |-- †Anosteira ornata Leidy, 1871
                  |  |  |-- †Kyzilkumemys schultzi Nesov, 1977 [Anosteira shuvalovi] U. Cret. CAs.
                  |  |  `-- †Pseudoanosteira U. Eoc. NA.
                  |  `--o Carettochelyinae (Boulenger, 1887)
                  |     `-- Carettochelys insculpta Ramsay, 1886 (flynkilpikonna; New Guinea plateless river turtle)
                  `-- Trionychidae Fitzinger, 1826 [non Bell, 1828??] (pehmeäkilpikonnat)

?Trionychoidea incertae sedis:

Khunnuchelys Brickman, Nessov & Peng, 1993
        †K. kizulkumensis Brickman, Nessov & Peng, 1993
    Rafetus
        †(Axestemys)
            †R. (A.) bissinusR. (A.) nelsoniR. (A.) exquisitusR. (A.) uintanensisR. (A.) tritorR. (A.) salebrosusR. (A.) eloisae
        (Rafetus)

Reference(s):