1. Order [Unassigned]
   1. Superfamily Archinacelloidea Knight, 1952 †
   2. Superfamily Clisospiroidea S. A. Miller, 1889 †
   3. Family Codonocheilidae S. A. Miller, 1889 †
   4. Family Craspedostomatidae Wenz, 1938 †
   5. Family Crassimarginatidae Frýda, Blodgett & Lenz, 2002 †
   6. Family Discohelicidae M. Schröder, 1995 †
   7. Superfamily Euomphaloidea C. A. White, 1877 †
   8. Family Isospiridae Wangberg-Eriksson, 1964 †
   9. Superfamily Loxonematoidea Koken, 1889 †
   10. Superfamily Ophiletoidea Koken, 1907 †
   11. Superfamily Oriostomatoidea Koken, 1896 †
   12. Superfamily Palaeotrochoidea Knight, 1956 †
   13. Family Paraturbinidae Cossmann, 1916 †
   14. Family Pragoserpulinidae Frýda, 1998 †
   15. Family Raphistomatidae Koken, 1896 †
   16. Family Rhytidopilidae Starobogatov, 1976 †
   17. Family Scoliostomatidae Frýda, Blodgett & Lenz, 2002 †
   18. Family Sinuopeidae Wenz, 1938 †
   19. Superfamily Trochonematoidea Zittel, 1895 †
   20. Family Yuopisthonematidae Nützel, 2017 †
   21. Family Ceratopeidae Yochelson & Bridge, 1957 † accepted as Raphistomatidae Koken, 1896 †
   22. Family Opisthonematidae Yu, 1976 † accepted as Yuopisthonematidae Nützel, 2017 † (invalid: type genus a junior homonym)
   23. Superfamily Straparollinoidea P. J. Wagner, 2002 † accepted as Euomphaloidea C. A. White, 1877 † (unaccepted > junior subjective synonym)
   24. Family [Unassigned]
       1. Genus Eesticonus Peel, 2024 †
       2. Genus Eiserhardtia Frýda, 2000 †
       3. Genus Eocryphispira X.-H. Yu, 1987 †
       4. Genus Peverilia Arkell, 1941 †
       5. Genus Phanerotinus Sowerby, 1844 †
       6. Genus Rhenomphalus Bandel & Frýda, 1998 †
       7. Genus Solandangella Horný, 1995 †
       8. Genus Undularia Koken, 1892 †
       9. Genus Buccinites Gesner, 1758 (unaccepted > unavailable name)
       10. Genus Toxonema J. Böhm, 1895 † accepted as Undularia Koken, 1892 † (unaccepted > junior objective synonym, with the same type species)
       11. Genus Alciope A. Adams, 1861 (uncertain > taxon inquirendum, Invalid: junior homonym of Alciope Rafinesque, 1814 [Crustacea] and Alciope Grube, 1850.)
       12. Genus Vayssieria Fenaux, 1942 (uncertain > taxon inquirendum)

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