1. Species Modiolaria africana Bartsch, 1915 accepted as Gregariella difficilis (Deshayes, 1863)
2. Species Modiolaria albanyana W. H. Turton, 1932 accepted as Gregariella difficilis (Deshayes, 1863) (junior synonym)
3. Species Modiolaria arcuata A. Gould, 1861 accepted as Gregariella barbata (Reeve, 1858) (junior subjective synonym)
4. Species Modiolaria argentea (Reeve, 1858) accepted as Gregariella coralliophaga (Gmelin, 1791)
5. Species Modiolaria barbata Angas, 1868 accepted as Gregariella barbata (Reeve, 1858)
6. Species Modiolaria bourailensis T. D. A. Cockerell, 1929 accepted as Modiolus bourailensis (T. D. A. Cockerell, 1929) (original combination)
7. Species Modiolaria calceata Melvill & Standen, 1907 accepted as Musculus calceatus (Melvill & Standen, 1907)
8. Species Modiolaria corrugata (W. Stimpson, 1851) accepted as Musculus glacialis (Leche, 1883)
9. Species Modiolaria cuneata Jeffreys, 1880 accepted as Gregariella fischeri (E. A. Smith, 1885) (unaccepted > nomen nudum)
10. Species Modiolaria cuneata P. Fischer, 1882 accepted as Gregariella fischeri (E. A. Smith, 1885) (preoccupied by Modiolaria cuneata Gould, 1861)
11. Species Modiolaria cuneata A. Gould, 1861 accepted as Musculus coenobitus (Vaillant, 1865) (invalid: secondary junior homonym of Modiola cuneata J. Sowerby, 1818; Musculus chinensis Bernard, Cai & Morton, 1993 is a replacement name)
12. Species Modiolaria cuprea A. A. Gould, 1861 accepted as Musculus cupreus (A. Gould, 1861)
13. Species Modiolaria denticulata Dall, 1871 accepted as Gregariella denticulata (Dall, 1871) (original combination)
14. Species Modiolaria difficilis (Deshayes, 1863) accepted as Gregariella difficilis (Deshayes, 1863) (unaccepted > superseded combination)
15. Species Modiolaria discors (Linnaeus, 1767) accepted as Musculus discors (Linnaeus, 1767)
16. Species Modiolaria faba Beck, 1838 accepted as Musculus discors (Linnaeus, 1767)
17. Species Modiolaria fischeri E. A. Smith, 1885 accepted as Gregariella fischeri (E. A. Smith, 1885)
18. Species Modiolaria fischeri Locard, 1898 accepted as Gregariella fischeri (E. A. Smith, 1885)
19. Species Modiolaria ima Bartsch, 1915 accepted as Musculus imus (Bartsch, 1915)
20. Species Modiolaria impressa Dall, 1907 accepted as Musculus discors (Linnaeus, 1767)
21. Species Modiolaria laevigata (J. E. Gray, 1824) accepted as Musculus discors (Linnaeus, 1767)
22. Species Modiolaria laevis Beck in Robert, 1838 accepted as Musculus discors (Linnaeus, 1767)
23. Species Modiolaria miranda E. A. Smith, 1884 accepted as Musculus viridulus (H. Adams, 1871) (unaccepted > junior subjective synonym)
24. Species Modiolaria nigra (Gray, 1824) accepted as Musculus niger (J. E. Gray, 1824)
25. Species Modiolaria obermulleri Fischer-Piette & Nicklès, 1946 accepted as Gregariella obermulleri (Fischer-Piette & Nicklès, 1946)
26. Species Modiolaria perstriata Hedley, 1906 accepted as Rhomboidella perstriata (Hedley, 1906) (superseded combination)
27. Species Modiolaria petagnae (Scacchi, 1832) accepted as Gregariella petagnae (Scacchi, 1832)
28. Species Modiolaria polita (A. E. Verrill & S. Smith, 1880) accepted as Amygdalum politum (A. E. Verrill & S. Smith, 1880) (unaccepted combination)
29. Species Modiolaria pusio A. Adams, 1862 accepted as Musculus pusio (A. Adams, 1862) (unaccepted > superseded combination)
30. Species Modiolaria quadrula A. Gould, 1861 accepted as Musculus cupreus (A. Gould, 1861)
31. Species Modiolaria rhyllensis Gatliff & Gabriel, 1912 accepted as Rhomboidella rhyllensis (Gatliff & Gabriel, 1912)
32. Species Modiolaria rufa Coen, 1929 accepted as Musculus costulatus (Risso, 1826)
33. Species Modiolaria seminuda Dall, 1897 accepted as Vilasina seminuda (Dall, 1897)
34. Species Modiolaria semiradiata Verco, 1908 accepted as Musculus semiradiatus (Verco, 1908)
35. Species Modiolaria skomma R. A. McLean & Schwengel, 1944 accepted as Gregariella chenui (Récluz, 1842)
36. Species Modiolaria striatula Beck in Robert, 1838 accepted as Musculus niger (J. E. Gray, 1824)
37. Species Modiolaria taylori Dall, 1897 accepted as Musculus taylori (Dall, 1897)
38. Species Modiolaria varicosa A. Gould, 1861 accepted as Musculus varicosus (A. Gould, 1861) (original combination)
39. Species Modiolaria vernicosa Middendorff, 1849 accepted as Vilasina vernicosa (Middendorff, 1849)
40. Species Modiolaria corallina Tapparone Canefri, 1877 (uncertain > taxon inquirendum, use in more recent taxonomic literature currently undocumented)
41. Species Modiolaria expleta Gould, 1861 (uncertain > nomen dubium)

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