• Monoceros A.C.J. Van Goor, 1924
• Monoceros Bloch & Schneider, 1801 accepted as Naso Lacepède, 1801
• Monoceros Lamarck, 1816 accepted as Acanthina Fischer von Waldheim, 1807
• Monoceros Milne, 1916 accepted as Henoceros Milne, 1916
• Monoceros acuminatum G. B. Sowerby I, 1835 accepted as Acanthina monodon (Pallas, 1774)
• Monoceros ambiguus G. B. Sowerby I, 1846 accepted as Acanthina unicornis (Bruguière, 1789)
• Monoceros armigerus (Conrad, 1833) † accepted as Cornulina armigera (Conrad, 1833) †
• Monoceros blainvillei A. d'Orbigny, 1839 † accepted as Chorus blainvillei (A. d'Orbigny, 1839) †
• Monoceros blainvillei var. nodosus Möricke, 1896 † accepted as Chorus blainvillei (A. d'Orbigny, 1839) †
• Monoceros breve G. B. Sowerby I, 1822 accepted as Acanthina monodon (Pallas, 1774)
• Monoceros brevidentatum (W. Wood, 1828) accepted as Acanthais brevidentata (W. Wood, 1828)
• Monoceros calcar (Bruguière, 1789) accepted as Acanthina monodon (Pallas, 1774)
• Monoceros cancellatus Bellardi, 1882 † accepted as Spinucella cancellata (Bellardi, 1882) †
• Monoceros cingulatum Lamarck, 1816 accepted as Opeatostoma pseudodon (Burrow, 1815)
• Monoceros citrinum G. B. Sowerby I, 1835 accepted as Acanthina unicornis (Bruguière, 1789)
• Monoceros costatum G. B. Sowerby I, 1835 accepted as Acanthina monodon (Pallas, 1774)
• Monoceros crassilabrum Lamarck, 1816 accepted as Acanthina unicornis (Bruguière, 1789)
• Monoceros crassilabrum var. album G. B. Sowerby I, 1835 accepted as Acanthina unicornis (Bruguière, 1789)
• Monoceros cymatum G. B. Sowerby I, 1835 accepted as Mexacanthina lugubris (G. B. Sowerby I, 1822)
• Monoceros denticulatum W. Wood, 1828 accepted as Mexacanthina lugubris (G. B. Sowerby I, 1822)
• Monoceros doliaris R. A. Philippi, 1887 † accepted as Chorus doliaris (R. A. Philippi, 1887) †
• Monoceros falcatus Milne, 1916 accepted as Henoceros falcatus (Milne, 1916)
• Monoceros fusoides P. P. King, 1832 accepted as Chorus giganteus (R. P. Lesson, 1831)
• Monoceros garretti Seale, 1901 accepted as Naso lituratus (Forster, 1801)
• Monoceros giganteum R. P. Lesson, 1831 accepted as Chorus giganteus (R. P. Lesson, 1831)
• Monoceros glabratum Lamarck, 1816 accepted as Acanthina unicornis (Bruguière, 1789)
• Monoceros globulus G. B. Sowerby I, 1835 accepted as Acanthina unicornis (Bruguière, 1789)
• Monoceros grande G. B. Sowerby I, 1835 accepted as Neorapana grandis (G. B. Sowerby I, 1835)
• Monoceros grandis R. A. Philippi, 1887 † accepted as Chorus grandis (R. A. Philippi, 1887) †
• Monoceros imbricatum Lamarck, 1816 accepted as Acanthina monodon (Pallas, 1774)
• Monoceros isthmiiforme Van Goor, 1924 (uncertain > unassessed)
• Monoceros isthmiiformis Van Goor, 1924 accepted as Chaetoceros minimus (Levander) D.Marino, G.Giuffre, M.Montresor & A.Zingone, 1991 accepted as Rhizosolenia minima Levander, 1904
• Monoceros labiale Hupé, 1854 † accepted as Testallium cepa (G. B. Sowerby I, 1846) †
• Monoceros labialis (Hupé, 1854) † accepted as Testallium cepa (G. B. Sowerby I, 1846) †
• Monoceros laevis R. A. Philippi, 1887 † accepted as Chorus grandis (R. A. Philippi, 1887) †
• Monoceros lugubre G. B. Sowerby I, 1822 accepted as Mexacanthina lugubris (G. B. Sowerby I, 1822)
• Monoceros maculatum Gray, 1839 accepted as Acanthais brevidentata (W. Wood, 1828)
• Monoceros minimum (Levander) Valikangas, 1926 (uncertain > unassessed)
• Monoceros mirabilis Möricke, 1896 † accepted as Herminespina mirabilis (Möricke, 1896) †
• Monoceros opimum Hupé, 1854 † accepted as Testallium cepa (G. B. Sowerby I, 1846) †
• Monoceros paucilirata Stearns, 1871 accepted as Acanthinucella paucilirata (Stearns, 1871)
• Monoceros philippii Möricke, 1896 † accepted as Herminespina philippii (Möricke, 1896) †
• Monoceros punctulatum J. E. Gray, 1835 accepted as Acanthinucella punctulata (J. E. Gray, 1835)
• Monoceros pyrulatus R. A. Philippi, 1887 † accepted as Chorus doliaris (R. A. Philippi, 1887) †
• Monoceros striatum Lamarck, 1822 accepted as Acanthina monodon (Pallas, 1774)
• Monoceros tenuis R. A. Philippi, 1887 † accepted as Chorus grandis (R. A. Philippi, 1887) †
• Monoceros tuberculatum G. B. Sowerby I, 1835 accepted as Neorapana tuberculata (G. B. Sowerby I, 1835)
• Monoceros unicarinatum G. B. Sowerby I, 1835 accepted as Acanthinucella spirata (Blainville, 1832)
• Monoceros ventrosus R. A. Philippi, 1887 † accepted as Chorus grandis (R. A. Philippi, 1887) †
• Purpura (Monoceros) Lamarck, 1816 accepted as Acanthina Fischer von Waldheim, 1807
• Purpura (Monoceros) brevidens Conrad, 1837 accepted as Acanthinucella spirata (Blainville, 1832)
• Purpura (Monoceros) engonata Conrad, 1837 accepted as Acanthinucella spirata (Blainville, 1832)
• Purpura (Monoceros) lapilloides Conrad, 1837 accepted as Acanthinucella punctulata (J. E. Gray, 1835)
• Purpura (Monoceros) lapilloides var. aurantia Dall, 1908 accepted as Acanthinucella spirata (Blainville, 1832)
• Purpura (Monoceros) tessellata R. P. Lesson, 1840 (uncertain > unassessed)