Chordata
Brevicollis Kott, 1990
Enterogona
Euherdmaniidae Ritter, 1904
Micrascidites Deflandre & Deflandre-Rigaud, 1957
Mysteraseidia Monniot & Monniot, 1982
Palaeobotryllus Muller, 1977
Placentelidae Kott, 1992
Pleurogona
Plidaeuridae
Syndendrodoa Tokioka, 1951
Yarnemia Nessov, 1984
