Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         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
                             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 Phaeophyceae Hansgirg (1886) - brown algae
                                             Order Ectocarpales Bessey (1907)
                                               Family Ectocarpaceaeᵀ C.Agardh (1828)
                                                 Genus Ectocarpusᵀ Lyngbye (1819), nom. cons.
                                                   Ectocarpus borealis (Kjellman) Kjellman (1890)
                                                   Ectocarpus caspicus Henckel
                                                   Ectocarpus fasciculatus Harvey (1841)
                                                   Ectocarpus flagelliformis Kützing (1843)
                                                   Ectocarpus fulvescens Schousboe ex Thuret
                                                   Ectocarpus helophorus Rosenvinge (1898)
                                                   Ectocarpus parvulus Kützing (1849)
                                                   Ectocarpus parvus (Saunders) Hollenberg (1971)
                                                   Ectocarpus rufulus Kützing (1843)
                                                   Ectocarpus siliculosus (Dillwyn) Lyngbye (1819)
                                                   Ectocarpus simpliusculus C.Agardh (1827)
                                                   Ectocarpus variabilis Vickers (1905)
                                                   Ectocarpus virescens Thuret ex Sauvageau