[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 Ralfsiaceae Farlow (1881)
             Genus Hapalospongidion Saunders (1899)
               1 Hapalospongidion macrocarpum (Feldmann, 1931) D. León-Álvarez & J. González-González (1993)