1. Genus Clio Linnaeus, 1767
   1. Species Clio andreae (Boas, 1886)
   2. Species Clio campylura (Tesch, 1948)
   3. Species Clio chaptalii Gray, 1850
   4. Species Clio convexa (Boas, 1886)
      1. Subspecies Clio convexa convexa (Boas, 1886)
      2. Subspecies Clio convexa cyphosa Rampal, 2002
   5. Species Clio cuspidata (Bosc, 1801)
   6. Species Clio flabelliforme (Blankenhorn, 1889)
   7. Species Clio orthotheca (Tesch, 1948)
   8. Species Clio piatkowskii van der Spoel, Schalk & Bleeker, 1992
   9. Species Clio polita Pelseneer, 1888
   10. Species Clio pyramidata Linnaeus, 1767
       1. Subspecies Clio pyramidata angusta (Boas, 1886)
       2. Subspecies Clio pyramidata antarctica Dall, 1908 accepted as Clio pyramidata Linnaeus, 1767 (superseded combination)
       3. Forma Clio pyramidata f. antarctica Dall, 1908 accepted as Clio pyramidata antarctica Dall, 1908
       4. Forma Clio pyramidata f. convexa (Boas, 1886) accepted as Clio convexa (Boas, 1886)
       5. Forma Clio pyramidata f. excisa van der Spoel, 1963 accepted as Clio pyramidata Linnaeus, 1767
       6. Forma Clio pyramidata f. lanceolata (Lesueur, 1813) accepted as Clio pyramidata Linnaeus, 1767 (junior subjective synonym)
       7. Forma Clio pyramidata f. martensii (Pfeffer, 1880) accepted as Clio pyramidata Linnaeus, 1767
       8. Forma Clio pyramidata f. pyramidata Linnaeus, 1767 accepted as Clio pyramidata Linnaeus, 1767
       9. Forma Clio pyramidata f. sulcata (Pfeffer, 1879) accepted as Clio pyramidata Linnaeus, 1767
       10. Forma Clio pyramidata f. tyrrhenica A. W. Janssen, 2012 accepted as Clio pyramidata Linnaeus, 1767
       11. Subspecies Clio pyramidata lanceolata (Lesueur, 1813) accepted as Clio pyramidata f. lanceolata (Lesueur, 1813)
       12. Subspecies Clio pyramidata pyramidata Linnaeus, 1767 accepted as Clio pyramidata f. pyramidata Linnaeus, 1767
       13. Variety Clio pyramidata var. convexa (Boas, 1886) accepted as Clio convexa (Boas, 1886)
   11. Species Clio recurva (Children, 1823)
   12. Species Clio scheelei (Munthe, 1888)
   13. Subgenus Clio (Creseis) Rang, 1828 accepted as Creseis Rang, 1828 (superseded combination)
   14. Species Clio antarctica Dall, 1908 accepted as Clio pyramidata antarctica Dall, 1908 (superseded combination)
   15. Species Clio australis Bruguière, 1792 accepted as Clione limacina australis (Bruguière, 1792)
   16. Species Clio balantium (Rang, 1834) accepted as Clio recurva (Children, 1823)
   17. Species Clio borealis (Pallas, 1774) accepted as Clione limacina (Phipps, 1774)
   18. Species Clio caudata Linnaeus, 1767 accepted as Clio pyramidata Linnaeus, 1767 (dubious synonym)
   19. Species Clio falcata Pfeffer, 1880 accepted as Clio polita Pelseneer, 1888
   20. Species Clio flavescens Gegenbaur, 1855 accepted as Paraclione flavescens (Gegenbaur, 1855)
   21. Species Clio helicina Phipps, 1774 accepted as Limacina helicina (Phipps, 1774) (original combination)
   22. Species Clio limacina Phipps, 1774 accepted as Clione limacina (Phipps, 1774) (original combination)
   23. Species Clio longicaudata Souleyet, 1852 accepted as Paraclione longicaudata (Souleyet, 1852)
   24. Species Clio mediterranea Gegenbaur, 1855 accepted as Cliopsis krohnii Troschel, 1854 (synonym)
   25. Species Clio miquelonensis Rang, 1825 accepted as Clione limacina (Phipps, 1774) (synonym)
   26. Species Clio punctata Tesch, 1903 accepted as Fowlerina punctata (Tesch, 1903)
   27. Species Clio quadrispinosa Rang, 1831 accepted as Clio cuspidata (Bosc, 1801) (synonym)
   28. Species Clio retusa Linnaeus, 1767 accepted as Clio pyramidata Linnaeus, 1767
   29. Species Clio sulcata (Pfeffer, 1879) accepted as Clio pyramidata f. sulcata (Pfeffer, 1879)
   30. Species Clio teschi McGowan, 1960 accepted as Clio convexa (Boas, 1886) (Unavailable name introduced in a thesis)
   31. Species Clio lamartinieri A. d'Orbigny, 1841 (uncertain > nomen dubium)
2. Genus Balantium Children, 1823 accepted as Clio (Balantium) Children, 1823
   1. Species Balantium bicarinatum W. H. Benson, 1837 accepted as Clio recurva (Children, 1823) (unaccepted > junior subjective synonym)
   2. Species Balantium recurvum Children, 1823 accepted as Clio recurva (Children, 1823) (original combination)
   3. Species Balantium sulcosum Bellardi, 1873 accepted as Clio sulcosa (Bellardi, 1873) †
3. Genus Cleodora Péron & Lesueur, 1810 accepted as Clio Linnaeus, 1767
   1. Subgenus Cleodora (Creseis) Rang, 1828 accepted as Creseis Rang, 1828 (original rank as subgenus)
      1. Species Cleodora (Creseis) acicula Rang, 1828 accepted as Creseis acicula (Rang, 1828) (superseded combination)
      2. Species Cleodora (Creseis) clava Rang, 1828 accepted as Creseis clava (Rang, 1828)
      3. Species Cleodora (Creseis) spinifera Rang, 1828 accepted as Styliola subula (Quoy & Gaimard, 1827) (synonym)
      4. Species Cleodora (Creseis) striata Rang, 1828 accepted as Hyalocylis striata (Rang, 1828)
      5. Species Cleodora (Creseis) virgula Rang, 1828 accepted as Creseis virgula (Rang, 1828) (superseded combination)
   2. Species Cleodora acicula Rang, 1828 accepted as Creseis acicula (Rang, 1828) (original combination)
   3. Species Cleodora andreae Boas, 1886 accepted as Clio andreae (Boas, 1886) (original combination)
   4. Species Cleodora balantium Rang, 1834 accepted as Clio recurva (Children, 1823)
   5. Species Cleodora brownii Blainville, 1825 accepted as Clio pyramidata Linnaeus, 1767 (synonym)
   6. Species Cleodora chaptalii Souleyet, 1852 accepted as Clio chaptalii Gray, 1850 (junior synonym)
   7. Species Cleodora chierchiae Boas, 1886 accepted as Boasia chierchiae (Boas, 1886) (original combination)
   8. Species Cleodora clava Rang, 1828 accepted as Creseis clava (Rang, 1828)
   9. Species Cleodora compressa Souleyet, 1852 accepted as Diacria trispinosa (Blainville, 1821)
   10. Species Cleodora conoidea A. Costa, 1873 accepted as Creseis conica Eschscholtz, 1829 (synonym)
   11. Species Cleodora curvata Souleyet, 1852 accepted as Cavolinia inflexa (Lesueur, 1813) (synonym)
   12. Species Cleodora exacuta A. Gould, 1852 accepted as Clio pyramidata Linnaeus, 1767 (junior subjective synonym)
   13. Species Cleodora falcata A. Gould, 1852 accepted as Creseis virgula virgula (Rang, 1828) (unaccepted > junior subjective synonym)
   14. Species Cleodora flexa Pfeffer, 1879 accepted as Creseis conica Eschscholtz, 1829 (unaccepted > junior subjective synonym)
   15. Species Cleodora inflata Souleyet, 1852 accepted as Clio recurva (Children, 1823) (suspected synonym)
   16. Species Cleodora lessonii Rang & A. Férussac, 1830 accepted as Clio cuspidata (Bosc, 1801) (synonym)
   17. Species Cleodora martensii Pfeffer, 1880 accepted as Clio pyramidata f. martensii (Pfeffer, 1880) (basionym)
   18. Species Cleodora munda A. Gould, 1852 accepted as Creseis virgula virgula (Rang, 1828) (junior subjective synonym)
   19. Species Cleodora obtusa Quoy & Gaimard, 1832 accepted as Cuvierina columnella (Rang, 1827)
   20. Species Cleodora occidentalis Dall, 1871 accepted as Clio pyramidata Linnaeus, 1767 (synonym)
   21. Species Cleodora placida A. Gould, 1852 accepted as Creseis virgula virgula (Rang, 1828) (junior subjective synonym)
   22. Species Cleodora pleuropa Souleyet, 1852 accepted as Cavolinia inflexa (Lesueur, 1813) (synonym)
   23. Species Cleodora pygmaea Boas, 1886 accepted as Diacria quadridentata (Blainville, 1821)
   24. Species Cleodora pyramidata (Linnaeus, 1767) accepted as Clio pyramidata Linnaeus, 1767
       1. Variety Cleodora pyramidata var. angusta Boas, 1886 accepted as Clio pyramidata angusta (Boas, 1886)
       2. Variety Cleodora pyramidata var. convexa Boas, 1886 accepted as Clio convexa (Boas, 1886) (superseded combination)
   25. Species Cleodora quadrispinosa Lesson, 1831 accepted as Clio cuspidata (Bosc, 1801)
   26. Species Cleodora recta (Blainville, 1827) accepted as Styliola subula (Quoy & Gaimard, 1827)
   27. Species Cleodora scheelei Munthe, 1888 accepted as Clio scheelei (Munthe, 1888)
   28. Species Cleodora strangulata Deshayes, 1823 accepted as Diacavolinia strangulata (Deshayes, 1823) (superseded combination)
   29. Species Cleodora striata Rang, 1828 accepted as Hyalocylis striata (Rang, 1828) (original combination)
   30. Species Cleodora subula Quoy & Gaimard, 1827 accepted as Styliola subula (Quoy & Gaimard, 1827) (superseded combination)
   31. Species Cleodora subulata Quoy & Gaimard, 1832 accepted as Styliola subula (Quoy & Gaimard, 1827) (synonym)
   32. Species Cleodora sulcata Pfeffer, 1879 accepted as Clio pyramidata f. sulcata (Pfeffer, 1879) (junior subjective synonym)
   33. Species Cleodora trifilis Troschel, 1854 accepted as Cavolinia tridentata (Forsskål, 1775)
   34. Species Cleodora vaticana Calandrelli, 1844 accepted as Clio pyramidata Linnaeus, 1767
   35. Species Cleodora cuspidata G. B. Sowerby II, 1884 (uncertain > taxon inquirendum, use in recent liteature currently undocumented)
   36. Species Cleodora lobata G. B. Sowerby II, 1877 (uncertain > taxon inquirendum, use in recent liteature currently undocumented)
   37. Species Cleodora orbignyi G. B. Sowerby II, 1884 (uncertain > taxon inquirendum, use in recent liteature currently undocumented)
4. Genus Euclio Bonnevie, 1913 accepted as Clio Linnaeus, 1767
   1. Species Euclio campylura Tesch, 1948 accepted as Clio campylura (Tesch, 1948)
   2. Species Euclio cuspidata (Bosc, 1801) accepted as Clio cuspidata (Bosc, 1801)
   3. Species Euclio orthotheca Tesch, 1948 accepted as Clio orthotheca (Tesch, 1948)
5. Genus Proclio Hubendick, 1951 accepted as Clio Linnaeus, 1767
   1. Species Proclio subteres Hubendick, 1951 accepted as Clio pyramidata f. antarctica Dall, 1908

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