AJACICYATHIDA, R. Bedford & J. Bedford, 1939: Cup two walled, solitary or low modular; inner wall of centripetal type of development; intervallum with septa, with or without plate tabulae
DOKIDOCYATHINA Vologdin, 1957: Intervallum with septa bearing a single longitudinal pore row.
AJACICYATHINA R. Bedford & J. Bedford, 1939: Intervallum with septa; pectinate tabulae or synapticulae may be present.
ERISMACOSCININA Debrenne, Rozanov, & Zhuravlev, 1989: Intervallum with septa and plate tabulae; synapticulae may be present.
Orders | |_ Suborders inside the Ajacicyathida | |_ Superfamillies inside the Dokidocyathina {Ajacicyathina , Erismacoscinina} | |_ Superfamillies inside the Ajacicyathina {Dokidocyathina , Erismacoscinina} | |_ Superfamillies inside the Erismacoscinina {Dokidocyathina , Ajacicyathina} | |_ Famillies inside the Dokidocyathina {Ajacicyathina , Erismacoscinina} | |_ Famillies inside the Ajacicyathina {Dokidocyathina , Erismacoscinina} | |_ Famillies inside the Erismacoscinina {Dokidocyathina , Ajacicyathina}