1. Subgenus Cassidea (Cassidaria) Lamarck, 1816 accepted as Cassidaria Lamarck, 1816 accepted as Galeodea Link, 1807 (unaccepted > superseded rank)
   1. Species Cassidea (Cassidaria) echinophora (Linnaeus, 1758) accepted as Galeodea echinophora (Linnaeus, 1758) (unaccepted > superseded combination)
2. Subgenus Cassidea (Cypraeicassis) Cossmann, 1903 accepted as Cypraeicassis Cossmann, 1903 accepted as Cypraecassis Stutchbury, 1837 (unaccepted > superseded rank)
   1. Species Cassidea (Cypraeicassis) crumena (Bruguière, 1792) accepted as Cypraecassis testiculus (Linnaeus, 1758) (unaccepted > junior subjective synonym)
3. Subgenus Cassidea (Echinophoria) Sacco, 1890 accepted as Echinophoria Sacco, 1890 (unaccepted > superseded rank)
   1. Species Cassidea (Echinophoria) intermedia (Brocchi, 1814) † accepted as Echinophoria intermedia (Brocchi, 1814) † (unaccepted > superseded combination)
   2. Species Cassidea (Echinophoria) rondoletii (Basterot, 1825) † accepted as Echinophoria rondeleti (Basterot, 1825) † (unaccepted > superseded combination)
4. Subgenus Cassidea (Semicassis) Mörch, 1852 accepted as Semicassis Mörch, 1852
   1. Species Cassidea (Semicassis) anteniana K. Martin, 1931 † accepted as Semicassis anteniana (K. Martin, 1931) †
   2. Species Cassidea (Semicassis) bituminata K. Martin, 1933 † accepted as Galeodea bituminata (K. Martin, 1933)
   3. Species Cassidea (Semicassis) brasili Cossmann & Pissarro, 1905 † accepted as Cassis brasili (Cossmann & Pissarro, 1905) † (basionym)
   4. Species Cassidea (Semicassis) laevigata (Defrance, 1817) † accepted as Semicassis laevigata (Defrance, 1817) † (unaccepted > superseded combination)
   5. Species Cassidea (Semicassis) maussieri Cossmann, 1923 † accepted as Cassis maussieri (Cossmann, 1923) †
   6. Species Cassidea (Semicassis) miolaevigata Sacco, 1890 † accepted as Semicassis laevigata (Defrance, 1817) †
   7. Species Cassidea (Semicassis) reticulata (Bellardi & Michelotti, 1840) † accepted as Semicassis reticulata (Bellardi & Michelotti, 1840) † (unaccepted > superseded combination)
   8. Species Cassidea (Semicassis) umbgrovei K. Martin, 1931 † accepted as Semicassis umbgrovei (K. Martin, 1931) †
   9. Species Cassidea (Semicassis) vandervlerki K. Martin, 1933 † accepted as Semicassis vandervlerki (K. Martin, 1933) † accepted as Echinophoria vandervlerki (K. Martin, 1933) †
5. Species Cassidea bandata Perry, 1811 accepted as Phalium bandatum (Perry, 1811) (original combination)
6. Species Cassidea bituminata K. Martin, 1933 † accepted as Galeodea bituminata (K. Martin, 1933) (superseded combination)
7. Species Cassidea canaliculata Bruguière, 1792 accepted as Semicassis canaliculata (Bruguière, 1792) (unaccepted > superseded combination)
8. Species Cassidea carinata Bruguiére, 1792 † accepted as Galeodea carinata (Bruguiére, 1792) † (unaccepted > superseded combination)
9. Species Cassidea cernica (G. B. Sowerby III, 1888) accepted as Casmaria cernica (G. B. Sowerby III, 1888)
10. Species Cassidea crumena Bruguière, 1792 accepted as Cypraecassis testiculus (Linnaeus, 1758) (unaccepted > junior subjective synonym)
11. Species Cassidea fasciata Bruguière, 1792 accepted as Cassis tessellata (Gmelin, 1791) (unaccepted > junior subjective synonym)
12. Species Cassidea granulosa Bruguière, 1792 accepted as Semicassis granulata (Born, 1778) (unaccepted > junior subjective synonym)
13. Species Cassidea labiata G. Perry, 1811 accepted as Semicassis labiata (G. Perry, 1811) (superseded combination)
14. Species Cassidea multisecta H. J. Finlay, 1924 † accepted as Semicassis pyrum (Lamarck, 1822) (junior subjective synonym)
15. Species Cassidea perryi Iredale, 1912 accepted as Casmaria perryi (Iredale, 1912) (superseded combination)
16. Species Cassidea royana Iredale, 1914 accepted as Semicassis royana (Iredale, 1914) (original combination)
17. Species Cassidea saburon Bruguière, 1792 accepted as Semicassis saburon (Bruguière, 1792)
18. Species Cassidea sinuosa Verco, 1904 accepted as Semicassis sinuosa (Verco, 1904) (unaccepted > superseded combination)
19. Species Cassidea stadialis Hedley, 1914 accepted as Semicassis pyrum (Lamarck, 1822) (junior subjective synonym)
20. Species Cassidea strigata Shirley, 1911 accepted as Phalium glaucum (Linnaeus, 1758)
21. Species Cassidea sulcosa Bruguière, 1792 accepted as Semicassis undulata (Gmelin, 1791) (unaccepted > junior subjective synonym)
22. Species Cassidea tuberculata Fischer von Waldheim, 1807 accepted as Argobuccinum pustulosum ([Lightfoot], 1786) (junior subjective synonym)

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