[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 Erythropeltidales Garbary, Hansen & Scagel (1980)
           Family Erythropeltidaceae Skuja (1939) see Family Erythrotrichiaceae G.M. Sm. (1933)
             1 Genus Erythrocladia Rosenvinge (1909)
             2 Genus Erythrotrichia Aresch. (1850)
             3 Genus Porphyropsis Rosenvinge (1909)
             4 Genus Porphyrostromium Trevis. (1848)
             5 Genus Sahlingia P. Kornmann (1989)