Biota | Animalia | Cnidaria | Medusozoa | Hydrozoa | Trachylinae | Trachymedusae | Rhopalonematidae | Pectis
|  | Hatschek, 1888 | Petersen, 1979 | Owen, 1843 | Haeckel, 1879 | Haeckel, 1866 | Russell, 1953 | Haeckel, 1879