[Class] Polycystinea Ehrenberg, 1838 - polycystines see Superclass Polycystinia Ehrenberg, 1838
   Order Nassellaria Ehrenberg, 1875 see Class Nassellaria Ehrenberg, 1847
     Family Plagiacanthidae Hertwig, 1879
       01 Genus Amphiplecta Haeckel, 1881
       02 Genus Antarctissa Petrushevskaya, 1967
       03 Genus Arachnocorallium Haeckel, 1887
       04 Genus Arachnocorys Haeckel, 1860
       05 Genus †Archipilium Haeckel, 1881
       06 Genus Archiscenium Haeckel, 1881
       07 Genus †Botryopera Haeckel, 1887
       08 Genus Callimitra Haeckel, 1881
       09 Genus Ceratocyrtis Bütschli, 1881
       10 Genus Cladoscenium Haeckel, 1881
       11 Genus Clathrocanium Ehrenberg, 1860
       12 Genus †Clathrocorona Haeckel, 1881
       13 Genus Clathrocorys Haeckel, 1881
       14 Genus Clathromitra Haeckel, 1881
       15 Genus Enneaphormis Haeckel, 1881
       16 Genus Euscenarium Haeckel, 1887
       17 Genus Euscenium Haeckel, 1887
       18 Genus †Helotholus Jørgensen, 1905
       19 Genus †Lamprotripus Haeckel, 1881
       20 Genus Lithomelissa Ehrenberg, 1847
       21 Genus Lithopilium Popofsky, 1913
       22 Genus Lophophaena Ehrenberg, 1847
       23 Genus †Lophophaenoma Haeckel, 1887
       24 Genus Mitrocalpis Haeckel, 1881
       25 Genus Neosemantis Popofsky, 1913
       26 Genus †Peridium Haeckel, 1881
       27 Genus Peromelissa Haeckel, 1881
       28 Genus Phormacantha Jørgensen, 1905
       29 Genus Plagiacantha Claparède, 1856
       30 Genus Plectacantha Jørgensen, 1905
       31 Genus Plectagonidium Cachon & Cachon, 1969
       32 Genus †Pleuropodium Haeckel, 1881
       33 Genus Protoscenium Jørgensen, 1905
       34 Genus Pseudocubus Haeckel, 1887
       35 Genus Pseudodictyophimus Petrushevskaya, 1971
       36 Genus Pteropilium Haeckel, 1881
       37 Genus Pteroscenium Haeckel, 1881
       38 Genus †Rhabdolithis Ehrenberg, 1847
       39 Genus Sethophormis Haeckel, 1887
       40 Genus †Spongomelissa Haeckel, 1887
       41 Genus Tetraphormis Haeckel, 1881
       42 Genus Tetraplecta Haeckel, 1881
       43 Genus †Tripilidium Haeckel, 1881
       44 Genus †Tripocalpis Haeckel, 1881
       45 Genus †Tripodiscinus Haeckel, 1887
       46 Genus †Tripophaenoscenium Campbell & Clark, 1944
       47 Genus Trisulcus Popofsky, 1913, nom. illeg.
       48 Genus †Velicucullus Riedel & Campbell, 1952