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

<==o †Diadectomorpha
   |--o †Limnoscelidae
   |  |-- †Limnoscelis paludis Williston, 1911
   |  |-- †Limnosceloides brachycoles
   |  |-- †Limnoscelops
   |  |-- †Limnostygis
   |  `?- †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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