After Carroll, 1988, and Senter, 2004

<==o Diapsida Osborn, 1903 (diapsid reptiles; kaksiohimoaukkoiset matelijat)
   |?- †Spinoequalis deBraga & Reisz, 1995
   |--o †Araeoscelida Williston, 1913
   |  |?- †Kadaliosaurus priscus Credner, 1889; L.Perm. WEu.
   |  |?- †Dictybolus tener Olson, 1970
   |  |-- †Petrolacosaurus kansensis Lane [Petrolacosauridae]
   |  `--o †Araeoscelidae
   |     |-- †Zarcasaurus tandyderus Brinkman, Berman & Eberth, 1984
   |     `--o †Araeoscelis Williston, 1910 [Ophiodeirus]
   |        |-- †A. gracilis Williston, 1910
   |        `-- †A. casei (Broom 1913) [Ophiodeirus casei Broom 1913]
   |?- †Sphodrosaurus pennsylvanicus Colbert, 1960
   |?- †Palacrodon browni Broom, 1906 [Fremouwsaurus geludens Gow, 1992]
   |?-o †Omphalosaurus Merriami, 1906 [Omphalosauridae Merriam, 1906] sensu Motani, 2000 [a marine, non-ichthyopterygian, diapsid?]
   |  |-- †O. nevadanus Merriami, 1906
   |  |-- †O. nisseri Merriami, 1911?
   |  |-- †O. netterhynchus Mazin & Buchner, 1987
   |  `-- †O. wolfi Tichy, 1995
   `--+-- Neodiapsida Gauthier, 1984 sensu Benton, 1985 (advanced diapsids)
      `--o †Avicephala Senter, 2004
         |?- †Longisquama insignis Sharov, 1970 [Longisquamidae Sharov, 1970] [problematic, see Lepidosauriformes or Archosauria for alternative phylogenetic positions]
         |--o †Coelurosauravidae [Weigeltisauridae]
         |  |--o †Rautiania Bulanov & Sennikov, 2006; U.Perm. EEu.
         |  |  |-- †R. alexandri Bulanov & Sennikov, 2006
         |  |  `-- †R. minichi Bulanov & Sennikov, 2006
         |  `--o †Coelurosauravus Piveteau, 1926 [Gracilisaurus Weigelt, 1930; Palaeochamaelo Weigelt, 1930; Weigeltisaurus Kuhn, 1936; Daedalosaurus Carroll, 1976] U.Perm. CEu. Mad.
         |     |-- †C. elivensis Piveteau, 1926 [Daedalosaurus magagascariensis Carroll, 1976] 
         |     `?- †C. jaekeli (Weigelt, 1930) [Palaeochamaelo jaekeli Weigelt, 1930; Weigeltisaurus jaekeli (Weigelt, 1930) Kuhn, 1936; Gracilisaurus ottoi Weigelt, 1930] [cospesific with C. elivensis??]
         `--o †Simiosauria Senter, 2004
            |-- †Simiosauria genera et species indet. [MCSNB 4751]
            `--+-- †Hypuronector limnaios Colbert & Olsen, 2001
               `--o †Drepanosauridae [Megalancosauridae Renesto, 1994]
                  |?- †Drepanosauridae genera et species indet. [GR 1113] [U. Tri. SWNA.] [Harris & Downs, 2002]
                  |-- †Drepanosaurus unguicaudatus Pinna, 1979
                  `--+-- †Dolabrosaurus aquatilis Berman & Reisz, 1994
                     `-- †Megalancosaurus preonensis Calzavara et al., 1980

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