[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Kingdom Algae L. (1753) see [unranked] Algae
     Phylum Phaeophycota see Class Phaeophyceae Hansgirg (1886)
       Class Phaeophyceae Hansgirg (1886) - brown algae
         Order Scytosiphonales
           Family Scytosiphonaceae Farlow (1881)
             Genus Petalonia Derbès & Solier (1850), nom. cons.
               1 Petalonia fascia (O.F.Müll.) Kuntze (1898)
               2 Petalonia filiformis (Batters) Kuntze
               3 Petalonia zosterifolia (Reinke) Kuntze (1898)