Semaeostomeae

Semaeostomeae (literally "flag mouth") is an order of large jellyfish characterized by four long, frilly oral arms flanking its quadrate "mouth". Its gastrovascular system consists of unbranched pouches and it has no ring canal. Five families have been described.

Families

 * Cyaneidae
 * Depastridae
 * Halicyathidae
 * Pelagiidae
 * Ulmaridae