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 Rhodophycota see Phylum Rhodophyta Wettst. (1901)
           Class Rhodophyceae Thuret (1855) - red algae see Phylum Rhodophyta Wettst. (1901)
             Subclass Florideophycideae see Class Florideophyceae Cronquist (1960)
               Order Gigartinales F.Schmitz
                 01 Family Gymnophlaeaceae
                 02 Family Gracilariaceae Nägeli (1847)
                 03 Family Sebdeniaceae
                 04 Family Calosiphoniaceae Kylin (1932)
                 05 Family Petrocelidaceae
                 06 Family Phyllophoraceae Nägeli (1847)
                 07 Family Gigartinaceae Kützing (1843)
                 08 Family Chondriellaceae Levring (1941)
                 09 Family Polyideaceae Kylin (1956) see Family Polyidaceae Kylin (1956), nom. cons.
                 10 Family Nizymeniaceae Womersley (1971)
                 11 Family Rhizophyllidaceae Schmitz (1889)
                 12 Family Acrotylaceae Schmitz (1892)
                 13 Family Plocamiaceae Kütz. (1843), nom. cons.
                 14 Family Sphaerococcaceae Schmitz & Hauptfleisch
                 15 Family Phacelocarpaceae Searles (1968)
                 16 Family Sarcodiaceae Kylin (1932)
                 17 Family Furcellariaceae Kylin (1932)
                 18 Family Solieriaceae Agardh (1876)
                 19 Family Hypneaceae J.Agardh (1851)
                 20 Family Rissoellaceae Kylin
                 21 Family Rhabdoniaceae
                 22 Family Cubiculosporaceae Kraft (1973)
                 23 Family Rhodophyllidaceae see Family Cystocloniaceae Kützing (1843)
                 24 Family Mychodeaceae Kylin (1932)
                 25 Family Dicranemaceae see Family Dicranemataceae Kylin (1932)
                 26 ?Family Cruoriaceae (J.Agardh) Kylin (1928)
                 27 Family Blinksiaceae Hollenberg & Abbott (1968)