life see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Arthropoda Siebold, 1848 - arthropods
     Class Arachnida Lamarck, 1801
       Micrura Hansen & Sørensen, 1904
         Acaromorpha Dubinin, 1957
           Order Ricinulei Thorell, 1876 - ricinuleids
             Suborder Neoricinulei Selden, 1992
               Family Ricinoididae Ewing, 1929
                 1 Genus Ricinoides Ewing, 1929
                 2 Genus Cryptocellus Westwood, 1874
                 3 Genus Pseudocellus Platnick, 1980