Class Anthozoa Ehrenberg, 1831
   Subclass Octocorallia Haeckel, 1866 - octocorals see Subclass Alcyonaria
     Order Alcyonacea Lamouroux, 1816 - soft corals
       Family Nidaliidae
         1 Genus Agaricoides Simpson, 1905
         2 Genus Chironephthya Wright & Studer, 1889
         3 Genus Nephthyigorgia Kükenthal, 1910
         4 Genus Nidalia Gray, 1835
         5 Genus Nidaliopsis Kükenthal, 1906
         6 Genus Orlikia Malyut, 1993
         7 Genus Pieterfaurea Verseveldt & Bayer, 1988
         8 Genus Siphonogorgia Kölliker, 1874