living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Plantae Haeckel (1866) - plants
       Subkingdom Thallobionta
         Division Chlorophycota see Phylum Chlorophyta Pascher (1914)
           Class Chlorophyceae Wille (1884) - chlorophytes
             Order Chlorococcales Pascher see Order Chlamydomonadales F.E. Fritsch
               Family Oocystaceae Bohlin
                 Genus Ankistrodesmus Corda (1838)
                 Genus Chlorella M. Beijerinck (1890)
                 Genus Closteriopsis Lemmermann (1899)
                 Genus Dactylococcus Nägeli (1849)
                 Genus Glaucocystis Itzigs. (1866)
                 Genus Kirchneriella W. Schmidle (1893)
                 Subfamily Lagerheimioideae
                 Genus Monoraphidium Komárková-Legnerová, in Fott (1969)
                 Genus Oocystis A.Braun
                 Genus Prototheca W. Krüger (1894), nom. dub.
                 Genus Selenastrum Reinsch (1867)
                 Genus Tetraëdron Kützing (1845) see Genus Tetraedron Kützing (1845)
                 Genus Trochiscia F.T. Kützing (1845)