†order Ajacicyathida 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: Archaeocyatha according to F. Debrenne et al. 2015
See also Sepkoski 2002
Sister taxa: Adaecyathus, Archaeocyathida, Butovia, Capsulocyathida, Cornutocyathus, Irregulares, Kazachstanicyathida, Monocyathida, Putapacyathida, Regulares, Rhizacyathus
Subtaxa: Ajacicyathina Archaeocyathellus Botocyathus Dokidocyathina Erismacoscinina Kidjasocyathus Nevadacyathus Procyathellus Ptretiosocyathus Somphocyathus Stephanicyathus Tabulacyathus
Ecology: stationary intermediate-level epifaunal suspension feeder