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Class Hydrozoa

 Subclass HydroidolinaOrder Athecata (Anthomedusae or Anthoathecata)Suborder Capitata (Porpita, Millepora, Coryne)Suborder Aplanulata (Tubularia, Corymorpha)Suborder Filifera (Stylaster, Bouganvillia)Order Thecata (Leptomedusae or Leptothecata) (Aequorea, Campanularia)Order SiphonophoraSuborder – Cystonectae (Physalia)Suborder – Calycophorae (Muggiaea)Suborder – Physonectae (Agalma)

 Subclass TrachylinaOrder LimnomedusaeOrder TrachymedusaeOrder Narcomedusae

Class Cubozoa – Sea wasps and box jellies

 Order Chirodropida (Chyronex)

 Order Carybdeida (Carybdea)

Class Scyphozoa – “true jellyfish”

 Order – Coronatae – coronate medusae, common in deep‐sea – Periphylla

 Order – Semaeostomae – most typical large jellyfish – e.g. Aurelia

 Order – Rhizostomae – cannonball jellies

Class Staurozoa – Stalked jellyfish. Small sessile individuals – polypoid (Halyclistis)

Class Polypoidozoa – Intracellular parasites of developing fish eggs. Monospecific.