[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Kingdom Algae L. (1753) see [unranked] Algae
     Phylum Rhodophycota
       Class Rhodophyceae Thuret (1855) - red algae see Phylum Rhodophyta Wettst. (1901)
         Order Gigartinales F.Schmitz
           01 Family Calosiphonaceae see Family Calosiphoniaceae Kylin (1932)
           02 Family Caulacanthaceae Kützing (1843)
           03 Family Choreocolacaceae
           04 Family Cruoriaceae (J.Agardh) Kylin (1928)
           05 Family Cystocloniaceae Kützing (1843)
           06 Family Furcellariaceae Kylin (1932)
           07 Family Gigartinaceae Kützing (1843)
           08 Family Haemeschariaceae R.T. Wilce & Maggs
           09 Family Hypneaceae J.Agardh (1851)
           10 Family Nemastomataceae F.Schmitz (1892), nom. cons.
           11 Family Petrocelidaceae
           12 Family Phyllophoraceae Nägeli (1847)
           13 Family Polyidaceae Kylin (1956), nom. cons.
           14 Family Rissoellaceae Kylin
           15 Family Sarcodiaceae Kylin (1932)
           16 Family Schizymeniaceae (Schmitz & Hauptfleisch) Masuda & Guiry
           17 Family Sebdeniaceae
           18 Family Solieriaceae Agardh (1876)
           19 Family Wurdemanniaceae