Chelicerata Heymons, 1901
Count: 2c;12o; †6o;2f;23g
   Pseudoscorpiones De Geer, 1778
  Count: [g†g] 26f;22g; †1f;13g [8 Jan 2021]
     Homosyphronida Dunlop, Penney & Jekel, 2020, orth. inval. see Group Homosphyronida Chamberlin, 1929
    Count: [g†g] 23f;17g; †10g [8 Jan 2021]
       Atoposyphronida Dunlop, Penney & Jekel, 2020, orth. inval. see Suborder Atoposphyronida Harvey, 2019
      Count: [g†g] 2f;2g; †1g [8 Jan 2021]
         Superfamily Feaelloidea Ellingsen, 1906
        Count: [g†g] 2f;2g; †1g [8 Jan 2021]
           Family Feaellidae Ellingsen, 1906
          Count: [g†g] 1g; †1g [8 Jan 2021]
             Genus Feaella Ellingsen, 1906
            Count: -
               1 Subgenus Feaella (Tetrafeaella) Beier, 1955
              Count: -