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 Plantae Haeckel (1866) - plants
                           Subkingdom Viridiplantae Caval.-Sm. (1981) - green plants
                             Phylum Chlorophyta Pascher (1914) [coordinate rank] - green algae
                               "core chlorophytes"
                                 Class Ulvophyceae K.R. Mattox & K.D. Stewart (1984) - ulvophytes
                                   Order Bryopsidales J.H.Schaffn. (1922)
                                     Family Halimedaceae Link
                                       Genus Halimedaᵀ J.V.Lamour. (1812), nom. cons., orth. cons.
                                         Halimeda opuntia (L.) J.V.Lamour. (1812)
                                           1 Halimeda opuntia f. elongata (Barton) Barton
                                           2 Halimeda opuntia f. reinschii (Hauck, 1886) E.S. Barton
                                           3 Halimeda opuntia var. macrocarpa Askenasy