†suborder Ajacicyathina Bedford and Bedford 1939 (archaeocyath sponge)
Full reference: R. Bedford and J. Bedford. 1939. Development and classification of Archaeos (Pleospongia). Kyancutta Museum, Memoirs 6:67-82
Parent taxon: Ajacicyathida according to F. Debrenne et al. 2015
Sister taxa: Archaeocyathellus, Botocyathus, Dokidocyathina, Erismacoscinina, Kidjasocyathus, Nevadacyathus, Procyathellus, Ptretiosocyathus, Somphocyathus, Stephanicyathus, Tabulacyathus
Subtaxa: Annulocyathoidea Bronchocyathoidea Erbocyathoidea Ethmophylloidea Lenocyathoidea Pretiosocyathoidea Sigmocyathoidea Tercyathoidea Tumulocyathoidea
Ecology: stationary intermediate-level epifaunal suspension feeder