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L. Agassiz, 1862

Medusa: umbrella typically flatter than a hemisphere, with margin cleft into lappets; tentacles (if present) hollow, peripheral or on subumbrella; mouth opening single, lips 4, typically with 4 large mouth-arms surrounding. Polypoid stage: a polydisk scyphistoma.

Family Pelagiidae [Pelagia noctiluca ov ]
Family Cyaneidae [Desmonema gaudichaudi ov ]
Family Ulmaridae [Aurelia aurita ov; Diplulmaris antarctica ov ]

Order Semaeostomeae