Chelicerata Heymons, 1901
Count: 2c;12o; †6o;2f;23g
   Ricinulei Thorell, 1876 [monotypic] - ricinuleids
  Count: [g†g] 1f; †5f;7g [24 Dec 2020]
     Suborder †Primoricinulei Wunderlich, 2015
    Count: [†g] †3f;3g [24 Dec 2020]
       Family †Monooculrcinulidae Dunlop, Penney & Jekel 2017, orth. inval. [monotypic] see Family Monooculricinuleidae Wunderlich, 2017
      Count: [†g] †1g [24 Dec 2020]
         1 Genus †Monooculricinuleus Wunderlich, 2017
        Count: -