1. Species Cyamium antarcticum R. A. Philippi, 1845
2. Species Cyamium communis (Hedley, 1906)
3. Species Cyamium falklandicum Melvill & Standen, 1898
4. Species Cyamium willii Pfeffer, 1886
5. Subgenus Cyamium (Cyamiomactra) F. Bernard, 1897 accepted as Cyamiomactra F. Bernard, 1897
   1. Species Cyamium (Cyamiomactra) problematicum (F. R. Bernard, 1897) accepted as Cyamiomactra problematica F. Bernard, 1897 (superseded combination)
6. Subgenus Cyamium (Cyamionema) Melvill & Standen, 1914 accepted as Kidderia (Cyamionema) Melvill & Standen, 1914 represented as Kidderia Dall, 1876
   1. Species Cyamium (Cyamionema) decoratum Melvill & Standen, 1914 accepted as Kidderia pusilla (A. Gould, 1850) (junior subjective synonym)
7. Species Cyamium bennetti Preston, 1912 accepted as Cyamium antarcticum R. A. Philippi, 1845 (unaccepted > junior subjective synonym)
8. Species Cyamium commune Thiele, 1912 accepted as Kidderia bicolor (E. von Martens, 1885) (junior subjective synonym)
9. Species Cyamium copiosum Preston, 1913 accepted as Cyamium antarcticum R. A. Philippi, 1845 (unaccepted > junior subjective synonym)
10. Species Cyamium cuneatum Preston, 1913 accepted as Cyamium antarcticum R. A. Philippi, 1845 (unaccepted > junior subjective synonym)
11. Species Cyamium decoratum Melvill & Standen, 1914 accepted as Kidderia pusilla (A. Gould, 1850) (junior subjective synonym)
12. Species Cyamium denticulatum E. A. Smith, 1907 accepted as Cyamiocardium denticulatum (E. A. Smith, 1907) (original combination)
13. Species Cyamium exasperatum Preston, 1912 accepted as Cyamium antarcticum R. A. Philippi, 1845 (unaccepted > junior subjective synonym)
14. Species Cyamium fragillimum Thiele, 1912 accepted as Cyamiocardium fragillimum (Thiele, 1912)
15. Species Cyamium imitans Pfeffer, 1886 accepted as Kidderia minuta Dall, 1876
16. Species Cyamium iridescens J. E. Cooper & Preston, 1910 accepted as Cyamium falklandicum Melvill & Standen, 1898 (unaccepted > junior subjective synonym)
17. Species Cyamium mactroides Tate & May, 1900 accepted as Reloncavia mactroides (Tate & May, 1900)
18. Species Cyamium minutum (O. Fabricius, 1780) accepted as Turtonia minuta (O. Fabricius, 1780)
19. Species Cyamium mosthaffii Pfeffer, 1886 accepted as Cyamium willii Pfeffer, 1886 (unaccepted > junior subjective synonym)
20. Species Cyamium oblongum E. A. Smith, 1898 accepted as Kidderia oblonga (E. A. Smith, 1898) (superseded combination)
21. Species Cyamium piscium Preston, 1912 accepted as Cyamium antarcticum R. A. Philippi, 1845 (unaccepted > junior subjective synonym)
22. Species Cyamium rotundatum Thiele, 1912 accepted as Cyamiocardium rotundatum (Thiele, 1912) (original combination)
23. Species Cyamium stanleyense Preston, 1913 accepted as Cyamium antarcticum R. A. Philippi, 1845
24. Species Cyamium subquadratum Pelseneer, 1903 accepted as Mysella subquadrata (Pelseneer, 1903) (original combination)

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