[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 Chordariales
           Family Spermatochnaceae
             1 Genus Halorhiza F.T. Kützing (1843)
             2 Genus Nemacystus A. Derbès & A. Solier (1850)
             3 Genus Spermatochnus F.T. Kützing, 1843, nom. rej.
             4 Genus Stilophora J.Agardh (1841), nom. cons.
             5 Genus Stilopsis P. Kuckuck (1929)