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 Bacillariophyceae Haeckel (1878) - pennates
Subclass Bacillariophycidaeᵀ D.G.Mann (1990) - raphid diatoms
Order Achnanthales P.C.Silva (1962)
Family Achnanthidiaceae D.G.Mann (1990)
Genus Psammothidium L. Bukhtiyarova & Round (1996)
Psammothidium abundans (Manguin, in Bourelly & Manguin, 1954) L. Bukhtiyarova, in L. Bukhtiyarova & F.E. Round (1996)
Psammothidium acidoclinatum (Lange-Bertalot) Lange-Bertalot
Psammothidium altaicum (Poretzky) L. Bukhtiyarova, in L. Bukhtiyarova & F.E. Round (1996)
Psammothidium bioretii (Germain, 1957) L. Bukhtiyarova & Round (1996)
Psammothidium bristolicum Bukhtiyarova, in Bukhtiyarova & Round (1996)
Psammothidium buccolum (Cholnoky, 1966) L. Bukhtiyarova, in L. Bukhtiyarova & F.E. Round (1996)
Psammothidium chlidanos (M.H. Hohn & Hellerman) Lange-Bertalot
Psammothidium confusiforme van de Vijver & Beyens
Psammothidium daonense (Lange-Bertalot) Lange-Bertalot
Psammothidium didymum (Hustedt, 1933) L. Bukhtiyarova & F.E. Round (1996)
Psammothidium frigidum (Hustedt) L. Bukhtiyarova & F.E. Round (1996)
Psammothidium germainii (Manguin) Sabbe
Psammothidium grischunum (Wuthrich, 1975) L. Bukhtiyarova & F.E. Round (1996)
Psammothidium helveticum (Hustedt) L. Bukhtiyarova & F.E. Round (1996)
Psammothidium incognitum (Krasske) van de Vijver
Psammothidium investians (J.R. Carter, 1966) L. Bukhtiyarova, in L. Bukhtiyarova & F.E. Round (1996)
Psammothidium kuelbsii (Lange-Bertalot, in Lange-Bertalot & Krammer, 1989) L. Bukhtiyarova, in L. Bukhtiyarova & F.E. Round (1996)
Psammothidium lacus-vulcani (Lange-Bertalot, in Lange-Bertalot & Krammer, 1989) L. Bukhtiyarova, in L. Bukhtiyarova & F.E. Round (1996)
Psammothidium lauenburgianum (Hustedt, 1950) L. Bukhtiyarova & F.E. Round (1996)
Psammothidium levanderi (Hustedt, 1933) L. Bukhtiyarova & F.E. Round (1996)
Psammothidium manguinii (Hustedt) van de Vijver
Psammothidium marginulatum (Grunow, in Cleve & Grunow, 1880) L. Bukhtiyarova & F.E. Round (1996)
Psammothidium oblongellum (Østrup, 1902) van de Vijver
Psammothidium perpusillum (Østrup) Lange-Bertalot
Psammothidium pseudoswazi (J.R. Carter, 1963) L. Bukhtiyarova & F.E. Round (1996)
Psammothidium punctulatum (Simonsen, 1959) L. Bukhtiyarova & F.E. Round (1996)
Psammothidium rechtensis (Leclercq, 1983) Lange-Bertalot
Psammothidium reversum (Lange-Bertalot, in Lange-Bertalot & Krammer, 1989) L. Bukhtiyarova, in L. Bukhtiyarova & F.E. Round (1996)
Psammothidium rosenstockii (Lange-Bertalot) Lange-Bertalot
Psammothidium rossii (Hustedt, 1954) L. Bukhtiyarova & F.E. Round (1996)
Psammothidium sacculum (J.R. Carter) L. Bukhtiyarova, in L. Bukhtiyarova & F.E. Round (1996)
Psammothidium scoticum (Flower & Jones, 1989) L. Bukhtiyarova & F.E. Round (1996)
Psammothidium stauroneioidum (Manguin, in Bourelly & Manguin, 1954) L. Bukhtiyarova, in L. Bukhtiyarova & F.E. Round (1996)
Psammothidium strenzkei (Hustedt) L. Bukhtiyarova, in L. Bukhtiyarova & F.E. Round (1996)
Psammothidium subatomoides (Hustedt) L. Bukhtiyarova & F.E. Round (1996)
Psammothidium ventralis (Krasske) L. Bukhtiyarova & F.E. Round (1996)