1. Subgenus Oniscia (Margovoluta) Sacco, 1890 † accepted as Morum Röding, 1798 (unaccepted > junior subjective synonym)
   1. Species Oniscia (Margovoluta) bellardii Sacco, 1890 † accepted as Morum bellardii (Sacco, 1890) † (unaccepted > superseded combination)
2. Subgenus Oniscia (Oniscidia) Mörch, 1852 accepted as Morum (Oniscidia) Mörch, 1852 represented as Morum Röding, 1798 (unaccepted > superseded rank)
   1. Species Oniscia (Oniscidia) antiquissima K. Martin, 1914 † accepted as Morum antiquissimum (K. Martin, 1914) †
   2. Species Oniscia (Oniscidia) apenninica Sacco, 1890 † accepted as Morum neglectum (Michelotti, 1861) † (unaccepted > junior subjective synonym)
   3. Species Oniscia (Oniscidia) chavani Furon, 1948 † accepted as Morum chavani (Furon, 1948) † (unaccepted > superseded combination)
   4. Species Oniscia (Oniscidia) cythara (Brocchi, 1814) † accepted as Morum cythara (Brocchi, 1814) † (unaccepted > superseded combination)
   5. Species Oniscia (Oniscidia) domingensis (G. B. Sowerby I, 1850) † accepted as Morum domingense (G. B. Sowerby I, 1850) † (unaccepted > superseded combination)
   6. Species Oniscia (Oniscidia) verrucosa Michelotti, 1840 † accepted as Morum variolosum (Grateloup, 1834) † (unaccepted > junior subjective synonym)
   7. Species Oniscia (Oniscidia) postcythara Sacco, 1890 † (uncertain > unassessed)
3. Species Oniscia cancellata G. B. Sowerby I, 1825 accepted as Morum cancellatum (G. B. Sowerby I, 1825) (original combination)
4. Species Oniscia cithara G. B. Sowerby I, 1825 accepted as Morum cythara (Brocchi, 1814) † (unaccepted > unjustified emendation, of Buccinum cythara Brocchi, 1814)
5. Species Oniscia cithara R. B. Watson, 1881 accepted as Morum watsoni Dance & W. K. Emerson, 1967 (unaccepted > junior homonym, not Oniscia cithara G. B. Sowerby, 1825; Morum (Cancellomorum) watsoni Dance & W. K. Emerson, 1967 is a replacement name)
6. Species Oniscia dennisoni Reeve, 1842 accepted as Morum dennisoni (Reeve, 1842) (original combination)
7. Species Oniscia domingensis G. B. Sowerby I, 1850 † accepted as Morum domingense (G. B. Sowerby I, 1850) † (unaccepted > superseded combination)
8. Species Oniscia exquisita A. Adams & Reeve, 1850 accepted as Morum exquisitum (A. Adams & Reeve, 1850) (original combination)
9. Species Oniscia grandis A. Adams, 1855 accepted as Morum grande (A. Adams, 1855) (original combination)
10. Species Oniscia harpula Conrad, 1847 † accepted as Morum harpula (Conrad, 1847) † (unaccepted > superseded combination)
11. Species Oniscia lamarckii Deshayes, 1844 accepted as Morum lamarckii (Deshayes, 1844) accepted as Morum purpureum Röding, 1798
12. Species Oniscia macandrewi G. B. Sowerby III, 1889 accepted as Morum macandrewi (G. B. Sowerby III, 1889) (original combination)
13. Species Oniscia oniscus (G. B. Sowerby I, 1825) accepted as Morum oniscus (Linnaeus, 1767) (unaccepted > superseded combination)
14. Species Oniscia ponderosa Hanley, 1858 accepted as Morum ponderosum (Hanley, 1858) (original combination)
15. Species Oniscia quadriseriata Menke, 1830 accepted as Morum oniscus (Linnaeus, 1767)
16. Species Oniscia strombiformis Reeve, 1842 accepted as Morum strombiforme (Reeve, 1842)
17. Species Oniscia triseriata Menke, 1830 accepted as Morum oniscus (Linnaeus, 1767) (unnecessary substitute name for Strombus oniscus)
18. Species Oniscia tuberculosa Reeve, 1842 accepted as Morum tuberculosum (Reeve, 1842) (original combination)
19. Species Oniscia verrucosa Michelotti, 1840 † accepted as Morum variolosum (Grateloup, 1834) † (unaccepted > junior subjective synonym)

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