After Hirayama, 1997, 1998, Moody, 1997 and Lapparent de Broin, 2000

<==o Dermochelyidae Gray, 1825 (leatherback turtles; merinahkakilpikonnat)
   |-- †Corsochelys haliniches Zangerl, 1960; U. Cret. NA.
   |?- †Egyptemys eocaenus (Andrews, 1901)
   |?- †Miochelys fermini
   |?- †Cosmochelys dolloi Andrews, 1919
   |?- †Arabemys crassiscutata Pal. Eoc. NAf.
   `--+-- †Dermochelyidae gen. et sp. indet. [U. Cret. Japan (Hirayama, 1997)]
      `--+--o †Cardiochelys
         |  |-- †C. rupeliensis
         |  `-- †C. eocaemus
         `--+-- †Protosphargis veronensis
            `--+--o †Eosphargis
               |  |-- †E. gigas
               |  `-- †E. breineri
               `--+?- †"Thalassochelys" testei Bergounioux, 1956
                  `--+--o †Psephophorus Meyer, 1847
                     |  |-- †P. scaldii
                     |  |-- †P. polygonus Meyer, 1847
                     |  `-- †P. pseudostracion
                     |?- †Natemys peruvianus Olig. SA.
                     |?- †“Psephophorus” rupeliensis Olig. WEu.
                     |?- †“Psephophorus” terrypratchetti Köhler, 1995; Eoc. NZ.
                     |?- †Dermochelyidae gen. et sp. indet. aff. †“Psephophorus” terrypratchetti [Eoc. Ant.] [Albright, Woodburne, Case & Chaney, 2003]
                     |-- †Mesodermochelys
                     `-- Dermochelys coriacea Blainville, 1816 (leatherback turtle; merinahkakilpikonna)

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