[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
             Genus Nemacystus A. Derbès & A. Solier (1850)
               1 Nemacystus erythraeus (J.Agardh) Sauvageau (1897)
               2 Nemacystus flexuosus (C.Agardh) Kylin
               3 Nemacystus hispanicus (Sauvageau) Kylin (1940)