Heterobranchia Burmeister, 1837 see Superorder Heterobranchia Burmeister, 1837
Count: -
   1 "Lower heterobranchs"
  Count: -
   1.n.1.1 Rissoelloidea Gray, 1850
  Count: -
   1.n.1.2 Acteonoidea d'Orbigny, 1843
  Count: -
   1.n.2 Euthyneura s.l. Spengel, 1881
  Count: -