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 Heterokonta Caval.-Sm. (1986)
Phylum Ochrophyta Caval.-Sm. (1995)
Subphylum Khakista Caval.-Sm. (2000)
Diatomea Kütz. (1844)
Class Coscinodiscophyceae Round & R.M. Crawford (1990) [paraphyletic] - radial centrics
Subclass Coscinodiscophycidaeᵀ Round & R.M. Crawford (1990)
Order Coscinodiscalesᵀ Round & R.M. Crawford (1990)
Family Hemidiscaceae Hendey (1937)
Genus Actinocyclus Ehrenb. (1837)
Actinocyclus cholnokyi VanLand. (1967)
[Actinocyclus crassus (W.Sm.) Ralfs, in Pritchard (1861)]
see Actinocyclus octonarius var. crassus (W.Sm.) Hendey (1954)
Actinocyclus curvatulus Janisch, in Schmidt (1878)
[Actinocyclus divisus]
see Actinocyclus cholnokyi VanLand. (1967)
Actinocyclus ehrenbergi
[Actinocyclus ehrenbergii Ralfs, in Pritchard (1861)]
see Actinocyclus octonarius Ehrenb.
Actinocyclus kuetzingii (A.Schmidt, 1878) Simonsen (1975)
Actinocyclus normanii (Gregory ex Grev., 1859) Hustedt (1957)
Actinocyclus octonarius Ehrenb.
Actinocyclus ralfsii (W.Sm.) Ralfs, in Pritchard
Actinocyclus roperi (Bréb.) Grunow, in Van Heurck (1881)