1. Order [Unassigned]
   1. Superfamily Acteonoidea A. d'Orbigny, 1842
   2. Superfamily Rissoelloidea Gray, 1850
   3. Family [Unassigned]
      1. Genus Abrancha van Hasselt, 1824 (uncertain > taxon inquirendum)

1. Superorder Acochlidiimorpha
2. Order Aplysiida
3. Order Cephalaspidea
4. Superorder Eupulmonata
5. Superorder Hygrophila
6. Superorder Nudipleura
7. Superorder Pneumopulmonata
8. Order Pteropoda
9. Superorder Pylopulmonata
10. Superorder Ringiculimorpha
11. Order Runcinida
12. Superorder Sacoglossa
13. Superorder Siphonarimorpha
14. Order Tectibranchiata
15. Order Umbraculida
16. Order Anaspidea accepted as Aplysiida
17. Order Aplysiomorpha accepted as Aplysiida (alternative name)
18. Order Archaeopulmonata accepted as Siphonarioidea Gray, 1827
19. Superorder Ascoglossa accepted as Sacoglossa (synonym)
20. Superorder Basommatophora accepted as Hygrophila
21. Order Bullomorpha accepted as Cephalaspidea
22. Order Heterostropha accepted as Pyramidellidae J. E. Gray, 1840
23. Order Pleurobranchomorpha accepted as Pleurobranchida
24. Order Runcinacea accepted as Runcinida (change in suffix)
25. Order Thecosomata (abandoned concept, including Euthecosomata and Pseudothecosomata)
26. Superorder Euthyneura incertae sedis (temporary name)

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