[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
           Family Nemastomataceae F.Schmitz (1892), nom. cons.
             1 Genus Itonoa Masuda & Guiry (1995)
             2 Genus Nemastoma J.Agardh (1842)
             3 Genus Predaea De Toni f. (1936)
             4 Genus Tsengia K.C. Fan & Y.P. Fan (1962)