After Head, Raza & Gingerich, 1999, Lapparent de Broin, 2000, and Sukhanov, 2000

<==o Trionychidae Gray, 1825 [non Fitzinger, 1826; Bell, 1828??] (soft-shell turtles; pehmeäkilpikonnat)
   |?- †“Amyda” orlovi Khozatskii, 1976
   |?- †“Amyda” menenri Chkhikvadze & Shuvalov, 1988
   |?- †“Aspideretoides” maortuensis Yeh, 1965 [Kuhnemys Chkhikvadze, 1999]
   |?-o †Platypeltis Fitzinger, 1835
   |  |-- †P. amnicola
   |  `-- †P. trepida
   |?-o †Ulutrionychini Kordikova, 1994a [“paedomorphic trionychids with underdeveloped shells” (Vitek & Danilov, 2010)]
   |  |-- †Ulutrionyx
   |  `--o †Axestemys [incl.? Conchochelys; Paleotrionyx, Eurycephalochelys] [Rafetus (Axestemys)]
   |     |-- †A. bissinus
   |     |-- †A. nelsoni
   |     |-- †A. exquisitus
   |     |-- †A. uintanensis
   |     |-- †A. tritor
   |     |-- †A. salebrosus
   |     `-- †A. eloisae
   |?-o †Paraplastomeni Kordikova, 1994a [“trionychids with hyperossified shells” (Vitek & Danilov, 2010)]
   |  `--o †Paraplastomenus Korilova, 1991 [Crassithecachelys Chkhikvadze]
   |     `-- †p. mlynarskii (Chkhikvadze, 1970) [Plastomenus mlynarski Chkhikvadze, 1970]
   |?-o †Aspideretoides Gardner, Russell & Brickman, 1995
   |  |-- †A. allani (Gilmore, 1923)
   |  |-- †A. foveatus (Leidy, 1856)
   |  |-- †A. riabinini (Kuznetzov & Chkhikvadze, 1987) [Trionyx riabinini Kuznetzov & Chkhikvadze, 1987; “Plastomenusriabinini Chkhikvadze & Shuvalov, 1988; Parapastomenus riabinini Kordikova, 1991; Crassithecachelys riabinini Chkhikvadze, 2000]
   |  `-- †A. splendidus Hay, 1908
   |?- †Drazinderetes tethyensis Head, Raza & Gingerich, 1999
   |?- †“Trionyxaquitanicus
   |?- †“Trionyxbarbarae
   |?- †“Trionyxbohemicus Liebus, 1930
   |?- †“Trionyxbowerbankix
   |?- †“Trionyxbuiei
   |?- †“Trionyxgergensi
   |?- †“Trionyxhalophilus
   |?- †“Trionyxhenrici
   |?- †“Trionyxikoviensis
   |?- †“Trionyxincrassatus
   |?- †“Trionyxkansaiensis Vitek & Danilov, 2010 [Trionyx riabinini Kuznetzov & Chkhikvadze, 1987 (in partim); Khunnuchelys sp. nov.; Vitek & Danilov, 2008]
   |?- †“Trionyxkyrgyzensis Nesov, 1995
   |?- †“Trionyxmesselianus
   |?- †“Trionyxmiensis
   |?- †“Trionyxparisiensis
   |?- †“Trionyxphayrei
   |?- †“Trionyxplanus
   |?- †“Trionyxquinni
   |?- †“Trionyxrivosus
   |?- †“Trionyxrostratus
   |?- †“Trionyxsculptus
   |?- †“Trionyxvittatus
   |?- †“Trionyx” (Aspideretes) zakhidovi Khosatzky, 1966
   |--o Trionychinae Gray, 1825 (non Fitzinger, 1826) (softshell turtles; pehmeäkilpikonnat)
   |  |--+--+--o Apalone Rafinesque, 1832
   |  |  |  |  |?- †A. latus
   |  |  |  |  |-- A. ferox (Schneider, 1783) [Trionyx ferox] (Florida softshell turtle; piikkijokikilpikonna)
   |  |  |  |  |--o A. mutica (Le Sueur, 1827) [Trionyx muticus] (smooth softshell turtle)
   |  |  |  |  |  |-- A. m. mutica (Le Sueur, 1827)
   |  |  |  |  |  `-- A. m. calvatus (Webb, 1959)
   |  |  |  |  `--o A. spinifera (Le Sueur, 1827)  [Trionyx spinifer] (spiny softshell turtle)
   |  |  |  |     |-- A. s. aspera (Agassiz, 1857)
   |  |  |  |     |-- A. s. ater Webb & Legler, 1960
   |  |  |  |     |-- A. s. emoryi (Agassiz, 1857)
   |  |  |  |     |-- A. s. guadalupensis (Webb, 1962)
   |  |  |  |     |-- A. s. hartwegi (Conant & Goin, 1941)
   |  |  |  |     |-- A. s. pallidus (Webb, 1962)
   |  |  |  |     `-- A. s. spinifera (Le Sueur, 1827)
   |  |  |  `--o Rafetus
   |  |  |     |-- R. euphraticus (Daudin, 1802) [Trionyx euphraticus] (Euphrates softshell turtle)
   |  |  |     `-- R. swinhoei (Gray, 1873) [Rafetus vietnamensis Le et al. 2010] (Yangtze giant softshell turtle, Shanghai Softshell Turtle, Swinhoe’s Soft-shelled Turtle)
   |  |  `--+-- Trionyx triunguis (Forsskål, 1775) Geoffroy Saint-Hilaire, 1809 (African or Nile softshell turtle)
   |  |     `--+--o Chitra Grey, 1844
   |  |        |  |?- †C. minor Jaekel, 1911
   |  |        |  |?- †C. selenkae Jaekel, 1911
   |  |        |  |--o C. chitra (Asian narrow-headed softshell turtle)
   |  |        |  |  |-- C. c. chitra (Siamese narrow-headed softshell turtle)
   |  |        |  |  `-- C. c. javanensis (Javanese narrow-headed softshell turtle)
   |  |        |  |-- C. indica (Gray, 1831) (Indian narrow-headed shelled turtle)
   |  |        |  `-- C. vandijki (Burmese narrow-headed softshell turtle)
   |  |        `--o Pelochelys
   |  |           |-- P. bibroni (New Guinea giant softshell turtle)
   |  |           |-- P. cantorii (Cantor's giant softshell turtle)
   |  |           `-- P. signifera (Northern New Guinea giant softshell turtle)
   |  `--+--+--o Amyda Geoffroy Saint-Hilaire, 1809
   |     |  |  |-- †A. gregaria
   |     |  |  `-- A. cartilaginea (Boddaert, 1770) [Trionyx cartilagineus] (Asiatic softshell turtle)
   |     |  `--o Nilssonia [incl. Aspideretes]
   |     |     |-- N. formosa (Gray, 1869) [Trionyx formosus] (Burmese softshell turtle)
   |     |     |-- N. gangetica (Cuvier, 1825) [Trionyx gangeticus; Aspideretes gangetica] (Ganges softshell turtle)
   |     |     |-- N. hurum (Gray, 1831) [Trionyx hurum; Aspideretes hurum] (Peacock softshell turtle)
   |     |     |-- N. leithii (Gray, 1872) [Trionyx leithi; Aspideretes leithii] (Nagpur softshell turtle)
   |     |     `-- N. nigricans (Anderson, 1875) [Trionyx nigricans; Aspideretes nigricans] (Black softshell turtle)
   |     `--+-- Dogania subplana (Geoffroy Saint-Hilaire, 1809) Gray, 1844 [Trionyx subplanus] (Malayan softshell turtle)
   |        |-- Palea steindachneri (Siebenrock, 1906) Meylan, 1987 [Trionyx steindachneri] (Wattle-necked softshell turtle)
   |        `--o Pelodiscus Fitzinger, 1835
   |           |--o P. sinensis (Chinese softshell turtle)
   |           |  |-- P. s. sinensis
   |           |  `-- P. s. tuberculatus
   |           |-- P. axenaria (Hunan softshell turtle)
   |           |-- P. parviformis (Lesser Chinese softshell turtle)
   |           `-- P. maackii (Northern Chinese softshell turtle)
   `--+--o Plastomeninae Hay, 1908
      |  |-- †Gilmoremys lancensis
      |  `--+--o †Hutchemys Joyce, Revan, Lyson & Danilov, 2009
      |     |  |-- †H. acupictus (Hay, 1907) Joyce & Lyson, 2011 [†Plastomenus acupictus Hay, 1907]
      |     |  |--+-- †H. arctochelys Joyce, Revan, Lyson & Danilov, 2009
      |     |  |  `-- †H. rememdium Joyce, Revan, Lyson & Danilov, 2009
      |     |  `--+-- †H. tetanetron (Hutchison, 2009) Joyce &: Lyson, 2011
      |     |     `-- †H. sterea (Hutchison, 2009) Joyce & Lyson, 2011
      |     `--o †Plastomenus Cope, 1873
      |        |-- †P. catenatus Cope, 1875
      |        |-- †P. communis Cope, 1875
      |        |-- †P. corrugatus Cope, 1875
      |        |-- †P. costatus Cope, 1875
      |        |-- †P. fractus Cope, 1875
      |        |-- †P. insignis Cope, 1873
      |        |-- †P. lachrymalis Cope, 1874
      |        |-- †P. leptomitus Cope, 1875 [Trionyx leptomitus]
      |        |-- †P. molopinus Cope 1873 [Anostira molopinus]
      |        |-- †P. oedemius Cope, 1872
      |        |-- †P. punctulatus Cope, 1873
      |        |-- †P. robustus Gilmore, 1919
      |        |-- †P. tantillus Hay, 1908
      |        |-- †P. thomasii Cope, 1873
      |        |-- †P. torrejonensis Gilmore, 1919
      |        `-- †P. visendus Hay, 1908
      `--o Cyclanorbinae Lydekker, 1889 ()
         |--o Lissemys punctata (Lacépède, 1788)
         |  |-- L. p. punctata
         |  |-- L. p. granosa
         |  `-- L. p. scutata
         `--o Cyclanorbis Gray, 1835
            |--o C. elegans (Gray, 1869) -group
            |  |-- C. elegans (Gray, 1869)
            |  `-- C. sp. cf. C. elegans [Ethiopia & Sudan]
            |--o C. senegalensis (Duméril & Bibron, 1835) -group
            |  |-- C. senegalensis (Duméril & Bibron, 1835)
            |  |-- †C. turkanensis Meylan et al., 1990
            |  |-- †C. sp.1 [Uganda]
            |  |-- †C. sp.2 [Uganda]
            |  `-- †C. sp.3 [Uganda] [Cycloderma sp. sensu Meylan et al., 1990]
            `--o C. frenatum Peters, 1854 -group [Cycloderma]
               |-- C. frenatum Peters, 1854
               |-- †C. sp.1 cf. C. frenatum [Kenia]
               |-- †C. sp.2 cf. C. frenatum [Mozambique]
               |-- †C. sp.3 cf. C. frenatum [Ethiopia]
               |?- †C. victoriae (Andrews, 1914)
               |?- †C. debroinae Meylan et al., 1990
               |?- C. aubryi [Cycloderma]
               `?- C. sp. aff. C. melitensis [Cycloderma]

Reference(s):