Class Actinopoda Calkins, 1902 see Parvkingdom Actinopoda Calkins, 1902
   Subclass Radiolaria Müller, 1858 see Phylum Actinopoda Calkins, 1902
     Superorder Polycystina Ehrenberg, 1838 see Class Polycystinea Ehrenberg, 1838
       Order Nassellaria Ehrenberg, 1875 see Class Nassellaria Ehrenberg, 1847
         Family Plagiacanthidae Hertwig, 1879
           Subfamily Plagiacanthinae Hertwig, 1879
             01 Genus Dumetum Popofsky, 1908
             02 Genus Neosemantis Popofsky, 1913
             03 Genus Paracystidium Cachon & Cachon, 1969
             04 Genus Pentaplagia Cachon & Cachon, 1969
             05 Genus Plagiacanthaᵀ Claparède, 1856
             06 Genus Plagonium Haeckel, 1881
             07 Genus Plectagonidium Cachon & Cachon, 1969
             08 Genus Polyplecta Haeckel, 1887
             09 ?Genus Pseudocubus Haeckel, 1887
             10 Genus Rhabdolithis Ehrenberg, 1847
             11 Genus Tetraplagia Haeckel, 1881
             12 Genus Tetraplecta Haeckel, 1881