After Motani, 1998, 1999, Nicholls & Manabe, 2001, and Fischer, Maisch, Naish, Kosma, Liston, Joger, Krüger, Pérez, Tainsh & Appleby, 2012

<==o Ophthalmosauria Baur, 1887 sensu Motani, 1998
   `--o †Ophthalmosauridae Baur, 1887
      |-- †Arthropterygius chrisorum
      `--+--o †Ophthalmosaurinae Baur, 1887 sensu Fischer et al., 2012
         |  |-- †Mollesaurus perialus Fernández, 1999 [Mollesaurus periallus Fernández, 1999 (lapsus calami)]
         |  `--+-- †Ophthalmosaurus icenicus Seeley, 1874
         |     `--+-- †Ophthalmosaurus natans
         |        `-- †Acamptonectes densus Fischer, Maisch, Naish, Kosma, Liston, Joger, Krüger, Pérez, Tainsh & Appleby, 2012; E.Cret. WEu.
         `--o †Platypterygiinae  Arkhangel'skii, 2001 sensu Fischer et al., 2012
            |--+-- †Platypterygius hercynicus von Huene, 1922
            |  `--+-- †Caypullisaurus bonapartei Fernández, 1997
            |     `--+-- †Platypterygius australis (M'Coy, 1867)
            |        `-- †Athabascasaurus bitumineus
            `--+--o †Brachypterygius v. Huene, 1922 [Ichthyosaurus de la Beche & Conybeare, 1821; Grendelius McGowan, 1979]
               |  |?- †B. mordax (McGowan, 1979) McGowan, 1997 [Grendelius mordax McGowan, 1979] [may be synonymous with B. extremus (McGowan, 1997)]
               |  `-- †B. extremus (Boulenger, 1904) v. Huene, 1922 [Ichthyosaurus extremus Boulenger, 1904]
               `--+-- †Maiaspondylus lindoei Maxwell & Caldwell, 2006; L.Cret. NWNAm.
                  `--+-- †Aegirosaurus leptospondylus (Wagner, 1853a) Bardet & Fernandez, 2000 [taxonomic history]
                     `-- †Sveltonectes insolitus

Ophthalmosauridae incertae sedis:

Nannopterygius enthekiodon v. Huene, 1922
    †Paraophthalmosaurus Arkhangel'skii, 1997
        †P. saveljeviensis Arkhangel'skii, 1997
        †P. yasykovi (Efimov, 1999)
    †Otschevia pseudoscythica Efimov, 1998
    †Undorosaurus gorodischensis Efimov, 1999
    †Ophthalmosaurus Seeley, 1874 [Baptanodon]
        †O. sp. [Argentina]
        †O. monocharactusO. discusO. undorensis Efimov, 1991
    †Platypterygius von Huene, 1922 [Myobradypterygius von Huene, 1927; Simbirskiasaurus Ochev & Yefimov, 1985; Plutonisaurus Efimov, 1997; Plutoniosaurus (lapsus calami)]
        †P. americanusP. bannovkensis Arkhangel'skii, 1998
        †P. bedengensis (Efimov, 1997) [Plutonisaurus bedengensis Efimov, 1997]
        †P. birjukovi (Ochev & Efimov, 1985) [Simbirskiasaurus birjukovi Ochev & Yefimov, 1985; Simbirskia birjukovi (Ochev & Efimov, 1985)]
        †P. compylodonP. hauthali (von Huene, 1927) [Myobradypterygius hauthali von Huene, 1927]
        †P. kiprijanoffi (Romer, 1968) [Ichthyosaurus campylodon Kipriyanov, 1881, Myopterygius kiprijanoffi, Romer, 1968]
        †P. longmaniP. platydactylus (Broili, 1907)
        †P. sachicarum Páramo, 1997
        †p. sp. [cf. Ichthyosaurus australis Etheridge, 1904]

After Motani, 1998, 1999, and Nicholls & Manabe, 2001

<==o Ophthalmosauria
   |?- †Maiaspondylus
   `--o †Ophthalmosauridae
      |?- †Aegirosaurus
      |?- †Nannopterygius
      |?- †Paraophthalmosaurus
      |?- †Otschevia
      |?- †Undorosaurus
      |-- †Brachypterygius
      `--+--o †Ophthalmosaurus
         `--+-- †Caypullisaurus
            `-- †Platypterygius

Reference(s):