After Yates & Warren, 2000

<==o †Trematopsidae Williston, 1910 [incl.? Amphibamidae Moodie, 1909 sensu Yates & Warren 2000; Micropholidae Abel, 1919]
   |?-o †Platyrhinops [Amphibamidae]
   |  |-- †P. lyelli
   |  `-- †P. sp. cf. P. lyelli
   |?-o †Amphibamus [Amphibamidae]
   |  |-- †A. grandiceps
   |  `-- †A. lyelli (Wyman, 1858) [=? Platyrhinops lyelli]
   |?- †Micropholis stowi Huxley, 1859 [taxonomic history] [Amphibamidae]
   |?-o †Limnerpeton Fritsch, 1881 [= Fric] [taxonomic history]
   |  `-- †L. modestum (Fric, 1876) (nomen dubium) [type] [taxonomic history]
   |?-o †Actiobates
   |  |-- †A. peabodyi Eaton, 1973
   |  |-- †A. pricei [=? Acheloma pricei Olson, 1940]
   |  `-- †A. whitei [=? Acheloma whitei Olson, 1941]
   `--o †Trematopsidae sensu stricto
      |-- †Anconastes vesperus Berman, Reisz & Eberth, 1987
      `--+-- †Phonerpeton pricei (Olson, 1941) [Acheloma pricei Olson, 1940; Acheloma whitei Olson, 1941; Phonerpeton Dilkes, 1990]
         `--o †Acheloma Cope, 1882 [Trematops Williston, 1909]
            |-- †A. cumminsi Cope, 1882 [Trematops milleri Williston, 1909; Trematops thomasi Mahl, 1926]
            |-- †A. willistoni (Olson, 1941) [Trematops willistoni Olson, 1941]
            `-- †A. stonei (Olson, 1970) [Trematops stonei Olson, 1970]

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