After Laurin, Gauthier & Hedges, 1996-1997, Laurin & Gauthier, 1996-2000, Modesto, 1999, and Müller & Reisz, 2006 (with species information form “The Paleobiology Database”

<==o Amniota Haeckel, 1866 sensu lato (vesikalvolliset selkärankaiset)
   |?- †Casineria kiddi Paton et al., 1999
   `--o Amniota Haeckel, 1866 sensu stricto [the last common ancester of modern reptiles and mammals]
      |-- Synapsida Osborn, 1903 [Theropsida] (mammal-like amniotes; yksiohimoaukkoiset amniootit, nisäkäsmäiset amniootit)
      `--o Reptilia Laurenti, 1768 [Sauropsida] (true reptiles; matelijamaiset amniootit, aitomatelijat)
         |-- Parareptilia Olson, 1947 sensu Tsuji & Müller, 2009 [Anapsida Osborn, 1903 (paraphyletic); Proganosauria;] (anapsids, parareptiles; ohimoaukottomat amniootit, parareptiilit)
         `--o Eureptilia Olson, 1947
            `==o †“Protorothyrididae” Price, 1937 [Romeriidae Carroll, 1964 (in partim)]
               |-- †Coelostegus prothales Carroll & Baird, 1972; U.Carb. CEu.
               |--+-- †Thuringothyris mahlendorffae Boy & Martens, 1991; L.Perm. CEu.
               |  `-- †Captorhinidae Case, 1911 [Pariotichidae Cope, 1895; Romeriidae Carroll, 1964 (in partim)]
               `--o Romeriida Gauthier, Kluge & Rowe, 1988a [Romeriidae Carroll, 1964 (in partim)]
                  |-- †Brouffia orientalis Carroll & Baird, 1972; U.Carb. CEu.
                  `--+-- †Paleothyris acadiana Carroll, 1969
                     `--+--o †Hylonomus Dawson, 1860 [Fritschia] [Hylonomidae Moodie, 1916]
                        |  |-- †H. aciedentatus Dawson, 1860
                        |  |-- †H. lyelli Dawson, 1860 [Hylerpeton curtidentatum]
                        |  `-- †H. wymani Dawson, 1860
                        `--+--o †Protorothyrididae Price, 1937 sensu stricto [includes type; Protorothyris archeri Price, 1937]
                           |  |-- †Anthracodromemus longipes (Cope, 1874a) Carroll & Baird, 1972
                           |  |-- †Cephalerpeton ventriarmatum Moodie, 1912
                           |  `--o †Protorothyris Price, 1937 [Melanothyris Romer, 1952]
                           |     |-- †P. archeri Price, 1937
                           |     `-- †P. morani (Romer, 1952) [Melanothyris morani Romer, 1952]
                           `-- Diapsida Osborn, 1903 (diapsids; kaksiohimoaukkoiset amniootit)

Amniota incertae sedis:

ArcherpetonCoelodontognathus Otschev, 1967 [a procolophonoid-like form]
        †C. ricovi Otschev, 1967 
        †C. donensis Otschev, 1967 
    †Vitalia grata Ivakhnenko, 1973 [a procolophonoid-like form]

Reference(s):