After Carroll, 1967, Laurin & Reisz, 1997, and Lee & Spencer, 1997

<==o †Diadectomorpha
   |--o †Limnoscelidae Williston(?)
   |  |-- †Limnoscelis paludis Williston, 1911; L.Perm. SWNAm.
   |  |--o †Limnosceloides Romer, 1952; L.Perm. SWNAm.
   |  |  |-- L. dunkardensis Romer, 1952
   |  |  `-- L. brachycoles Langston, 1966
   |  |-- †Limnoscelops longifemur Levis & Vaughn, 1965; L.Perm. SWNAm.
   |  |-- †Limnostygis relictus Carroll, 1967, L.Carb. NENAm.
   |  `?- †Romeriscus periallus Baird & Carroll, 1967 [nomen dubium sensu Laurin & Reisz, 1992]
   `--+?- †Tseajaia campi Vaughn, 1964 [Tseajaiidae]
      `--o †Diadectidae
         |?- †Diadectidae genera et species indet. [Berman & Henrici, 2003] [L. Perm. CEu.]
         `--+-- †Desmatodon hesperis
            |--o †Diadectes [Diadectoides]
            |  |-- †D. absitus Berman et al., 1998
            |  |-- †D. maximus
            |  `-- †D. tenuitectus
            |?- †Diasparactus zenos Case
            `-- †Stephanospondylus

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