Class: Hydrozoa Owen, 1843

Subclass Hydroidolina Collins & Marques, 2004

   Order: Thecata (Leptomedusae) Fleming, 1828
       Suborder: Conica Broch, 1910
       Suborder: Proboscoida Broch, 1910
   Order: Athecata (Anthomedusae) Hincks, 1686