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 Halvaria Cavalier-Smith, 2010
Superphylum Alveolata Cavalier-Smith, 1991
Phylum Ciliophora Doflein, 1901 - ciliates
Subphylum Intramacronucleata Lynn, 1996 - amphiesmates
Class Litostomatea Small & Lynn, 1981
Subclass Haptoria Corliss, 1974
Order Haptoridaᵀ Corliss, 1974
Family Spathidiidae Kahl, 1929
Genus Arcuospathidium Foissner, 1984
Arcuospathidium cultriformeᵀ (Penard, 1922) Foissner, 1984
Arcuospathidium etoschense Foissner et al., 2002
Arcuospathidium lorjeae Foissner et al., 2002
Arcuospathidium namibiense Foissner et al., 2002
Arcuospathidium novaki Foissner et al., 2002