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 Phaeista Caval.-Sm. (1995)
                                       Infraphylum Marista Caval.-Sm. (2006)
                                         Superclass Fucistia Caval.-Sm. (1995)
                                           Class Xanthophyceae P. Allorge ex Fritsch (1935) - yellow-green algae
                                             Order Mischococcales
                                               Family Ophiocytiaceae Lemmermann (1899)
                                                 Genus Ophiocytiumᵀ Nägeli (1849), nom. cons.
                                                   Ophiocytium cuspidatum Wolle
                                                   Ophiocytium desertum
                                                   Ophiocytium elongatum
                                                   01 Ophiocytium parvulum (Perty) A.Braun
                                                   02 Ophiocytium maius Nägeli
                                                   03 Ophiocytium lagerheimii
                                                   04 Ophiocytium cochleare (Eichwald) A.Braun
                                                   05 Ophiocytium gracillimum
                                                   06 Ophiocytium maximum
                                                   07 Ophiocytium variabile
                                                   08 Ophiocytium capitatum Wolle
                                                   09 Ophiocytium bicuspidatum Lemmermann
                                                   10 Ophiocytium longipes
                                                   11 Ophiocytium mucronatum
                                                   12 Ophiocytium ilkae
                                                   13 Ophiocytium gracilipes
                                                   14 Ophiocytium arbusculum (A.Braun) Rabenh.