Stiasny, 1921
Mouth-arms three-winged; network of anastomosing canals issuing from primary ring canal (i.e. not from stomach), communicating with radial canals and only through them ultimately to stomach; subumbrellar muscles annular; rhopalar pits with radial folds; subgenital ostia narrowed by papillae.
Superfamily Inscapulatae
Superfamily Scapulatae