• Cymatium (Monoplex) Perry, 1810 accepted as Monoplex G. Perry, 1810
• Cymatium (Monoplex) aquatile (Reeve, 1844) accepted as Monoplex aquatilis (Reeve, 1844)
• Cymatium (Monoplex) cercadicum (Maury, 1917) † accepted as Monoplex cercadicus (Maury, 1917) †
• Cymatium (Monoplex) comptum (A. Adams, 1855) accepted as Monoplex comptus (A. Adams, 1855)
• Cymatium (Monoplex) comptum amphiatlanticum Garcia-Talavera & de Vera, 2003 accepted as Monoplex comptus (A. Adams, 1855)
• Cymatium (Monoplex) corrugatum Lamarck, 1816 accepted as Monoplex corrugatus (Lamarck, 1816)
• Cymatium (Monoplex) corrugatum amictum (Reeve, 1844) accepted as Monoplex amictus (Reeve, 1844)
• Cymatium (Monoplex) corrugatum krebsii (Mörch, 1877) accepted as Monoplex krebsii (Mörch, 1877)
• Cymatium (Monoplex) echo Kuroda & T. Habe, 1959 accepted as Monoplex parthenopeus (Salis Marschlins, 1793)
• Cymatium (Monoplex) echo iwakawanum Kuroda & Kira, 1964 accepted as Monoplex parthenopeus (Salis Marschlins, 1793)
• Cymatium (Monoplex) exaratum (Reeve, 1844) accepted as Monoplex exaratus (Reeve, 1844)
• Cymatium (Monoplex) intermedium (Pease, 1869) accepted as Monoplex intermedius (Pease, 1869)
• Cymatium (Monoplex) macrodon (Valenciennes, 1832) accepted as Monoplex macrodon (Valenciennes, 1832)
• Cymatium (Monoplex) martinianum (A. d'Orbigny, 1846) accepted as Monoplex pilearis (Linnaeus, 1758)
• Cymatium (Monoplex) norai García-Talavera & de Vera, 2004 accepted as Monoplex norai (García-Talavera & de Vera, 2004)
• Cymatium (Monoplex) parthenopeum (Salis Marschlins, 1793) accepted as Monoplex parthenopeus (Salis Marschlins, 1793)
• Cymatium (Monoplex) parthenopeum keenae (Beu, 1970) accepted as Monoplex keenae (Beu, 1970)
• Cymatium (Monoplex) parthenopeum parthenopeum (Salis Marschlins, 1793) accepted as Monoplex parthenopeus (Salis Marschlins, 1793)
• Cymatium (Monoplex) penniketi Beu, 1998 accepted as Monoplex penniketi (Beu, 1998)
• Cymatium (Monoplex) pileare (Linnaeus, 1758) accepted as Monoplex pilearis (Linnaeus, 1758)
• Cymatium (Monoplex) pileare (Linnaeus, 1758) sensu Dall, 1909 accepted as Monoplex macrodon (Valenciennes, 1832)
• Cymatium (Monoplex) pileare orientalis Garcia-Talavera, 1987 accepted as Monoplex pilearis (Linnaeus, 1758)
• Cymatium (Monoplex) rembangense (Wanner & Hahn, 1935) † accepted as Monoplex rembangensis (Wanner & Hahn, 1935) †
• Cymatium (Monoplex) tenuiliratum (Lischke, 1873) accepted as Turritriton tenuiliratus (Lischke, 1873)
• Cymatium (Monoplex) thersites (Reeve, 1844) accepted as Monoplex thersites (Reeve, 1844)
• Cymatium (Monoplex) vespaceum (Lamarck, 1822) accepted as Monoplex vespaceus (Lamarck, 1822)
• Monoplex G. Perry, 1810
• Monoplex amictus (Reeve, 1844)
• Monoplex aquatilis (Reeve, 1844)
• Monoplex australasiae Perry, 1811 accepted as Monoplex parthenopeus (Salis Marschlins, 1793)
• Monoplex boroni Thach, 2024
• Monoplex capitatus Perry, 1811 accepted as Tudicla spirillus (Linnaeus, 1767)
• Monoplex cecilianus (Dall, 1916) †
• Monoplex cercadicus (Maury, 1917) †
• Monoplex chlorostomoides (Maury, 1924) † (uncertain > taxon inquirendum)
• Monoplex comptus (A. Adams, 1855)
• Monoplex cornutus Perry, 1811 accepted as Monoplex exaratus (Reeve, 1844)
• Monoplex corrugatus (Lamarck, 1816)
• Monoplex dissimilis Landau, Beu, Breitenberger & Dekkers, 2020 †
• Monoplex distortus (Brocchi, 1814) †
• Monoplex doderleini (D'Ancona, 1873) †
• Monoplex durbanensis (E. A. Smith, 1899)
• Monoplex exaratus (Reeve, 1844)
• Monoplex formosus Perry, 1811 accepted as Ranularia gutturnia (Röding, 1798)
• Monoplex gatunicus Beu, 2010 †
• Monoplex gemmatus (Reeve, 1844)
• Monoplex gradatus Craig, Tracey & Gain, 2020 †
• Monoplex gurabonicus (Maury, 1917) †
• Monoplex heptagonus (Brocchi, 1814) †
• Monoplex infelix (Maury, 1924) † (uncertain > taxon inquirendum)
• Monoplex intermedius (Pease, 1869)
• Monoplex jackwinorum Beu, 2010 †
• Monoplex keenae (Beu, 1970)
• Monoplex klenei (G. B. Sowerby III, 1890)
• Monoplex krebsii (Mörch, 1877)
• Monoplex lignarius (Broderip, 1833)
• Monoplex longispira Beu, 2010 †
• Monoplex macrodon (Valenciennes, 1832)
• Monoplex martinianus (A. d'Orbigny, 1853) accepted as Monoplex pilearis (Linnaeus, 1758)
• Monoplex multicostatus (Cossmann & Peyrot, 1924) †
• Monoplex mundus (A. Gould, 1849)
• Monoplex nicobaricus (Röding, 1798)
• Monoplex norai (García-Talavera & de Vera, 2004)
• Monoplex oboesus Perry, 1811 accepted as Ranularia oboesa (Perry, 1811)
• Monoplex panamensis Beu, 2010 †
• Monoplex parthenopeus (Salis Marschlins, 1793)
• Monoplex penniketi (Beu, 1998)
• Monoplex pilearis (Linnaeus, 1758)
• Monoplex rembangensis (Wanner & Hahn, 1935) †
• Monoplex ritteri Schmelz, 1989 †
• Monoplex subcorrugatus (A. d'Orbigny, 1852) †
• Monoplex szakonyii Vicián & Z. Kovács, 2022 †
• Monoplex thersites (Reeve, 1844)
• Monoplex tjaringinensis (K. Martin, 1899) †
• Monoplex tranquebaricus (Lamarck, 1816)
• Monoplex trigonus (Gmelin, 1791)
• Monoplex turtoni (E. A. Smith, 1890)
• Monoplex vespaceus (Lamarck, 1822)
• Monoplex vestitus (Hinds, 1844)
• Monoplex wiegmanni (Anton, 1838)
• Monoplex williamsi (Maury, 1924) † (uncertain > taxon inquirendum)
• Septa (Monoplex) G. Perry, 1810 represented as Monoplex G. Perry, 1810
• Septa (Monoplex) parthenopea (Salis Marschlins, 1793) accepted as Monoplex parthenopeus (Salis Marschlins, 1793)
• Septa (Monoplex) parthenopea echo (Kuroda & T. Habe, 1959) accepted as Monoplex parthenopeus (Salis Marschlins, 1793)
• Septa (Monoplex) parthenopea keenae Beu, 1970 accepted as Monoplex keenae (Beu, 1970)
• Triton (Monoplex) Perry, 1810 accepted as Monoplex G. Perry, 1810
• Triton (Monoplex) fossatum A. Gould, 1860 accepted as Triton fossatum A. Gould, 1860 accepted as Monoplex parthenopeus (Salis Marschlins, 1793)