Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Clade neomura Cavalier-Smith, 1987
             Domain Eukaryota Chatton, 1925 - eukaryotes
               Clade discaria Cavalier-Smith, 2021
                 Clade natates Cavalier-Smith, 2021
                   Clade photaria Cavalier-Smith, 2021
                     Clade eucorta Cavalier-Smith, 2021
                       Superkingdom Corticata Lankester, 1878 - corticates
                         Kingdom Chromista Caval.-Sm. (1981) - chromists
                           Subkingdom Harosa Cavalier-Smith, 2010
                             [crown] Clade Sar Adl et al. 2012 [Simpson & Dunthorn 2020]
                               Infrakingdom Rhizaria Cavalier-Smith, 2002
                                 Phylum Retaria Cavalier-Smith, 2002
                                   Subphylum Foraminifera d'Orbigny, 1826
                                     Tubothalamea Pawlowski, Holzmann & Tyszka, 2013
                                       Class Miliolata Saidova, 1981 - porcelaneous foraminifers
                                         Subclass Miliamminana Mikhalevich, 1980
                                           Order Schlumbergerinidaᵀ Mikhalevich, 1980
                                             Family Sigmoilopsidae Vella, 1957
                                               Subfamily Sigmoilopsinaeᵀ Vella, 1957
                                                 Genus Sigmoilopsisᵀ Finlay, 1947
                                                   1 Sigmoilopsis schlumbergeriᵀ (Silvestri, 1904)
                                                   2 Sigmoilopsis procericollis Mikhalevich, 1977
                                                   3 Sigmoilopsis arenata (Cushman, 1921)
                                                   4 Sigmoilopsis flintii (Cushman, 1946)