Order Semaeostomeae Agassiz 1862
Alternative spelling: Semaeostomatida
Parent taxon: Discomedusae according to H. Van Iten et al. 2014
See also Pates et al. 2021 and Sepkoski 2002
Sister taxon: Rhizostomeae
Subtaxa: Cyaneidae Eulithotidae Pelagiidae Semaeostomitidae Ulmariidae
Distribution: