Clade Acoelomorpha Ehlers 1985
Parent taxon: Bilateria according to C. Nielsen 2012
See also Edgecombe et al. 2011 and Philippe et al. 2011
Sister taxa: Dickinsoniomorpha, Eubilateria, Ikaria, Rhombocorniculum, Siphusauctidae, Yunnanozoon
Subtaxa: Acoela Nemertodermatida Xenoturbellida