1. Species Grammysia bisulcata (Conrad, 1838) †
2. Species Grammysia circularis J. Hall & Whitfield, 1869 †
3. Species Grammysia elliptica J. Hall & Whitfield, 1869 †
4. Species Grammysia erecta J. Hall & Whitfield, 1869 †
5. Species Grammysia magna J. Hall & Whitfield, 1869 †
6. Species Grammysia nodosocostata J. Hall & Whitfield, 1869 †
7. Species Grammysia toliensis Z.-R. Yang, 1983 †
8. Species Grammysia abbreviata Chapman, 1908 † (uncertain > unassessed)
9. Species Grammysia barroisi Oehlert, 1881 † (uncertain > unassessed)
10. Species Grammysia burmeisteri J. M. Clarke, 1899 † (uncertain > taxon inquirendum)
11. Species Grammysia cotentina Oehlert, 1881 † (uncertain > unassessed)
12. Species Grammysia dubia C. L. Fenton & M. A. Fenton, 1924 † (uncertain > unassessed)
13. Species Grammysia famelica Herrick, 1888 † (uncertain > unassessed)
14. Species Grammysia glabra J. Hall, 1885 † (uncertain > unassessed)
15. Species Grammysia globosa J. Hall & Whitfield, 1869 † (uncertain > unassessed)
16. Species Grammysia laevigata Kayser, 1895 † (uncertain > unassessed)
17. Species Grammysia lirata J. Hall & Whitfield, 1869 † (uncertain > unassessed)
18. Species Grammysia montana Reed, 1908 † (uncertain > unassessed)
19. Species Grammysia obsoleta J. Hall & Whitfield, 1869 † (uncertain > unassessed)
20. Species Grammysia ovata J. Hall, 1885 † (uncertain > unassessed)
21. Species Grammysia ovata Herrick, 1888 † (uncertain > unassessed, junior homonym of Grammysia ovata J. Hall, 1885)
22. Species Grammysia oviformis Knod, 1908 † (uncertain > unassessed)
23. Species Grammysia praecursor J. Hall & Whitfield, 1869 † (uncertain > unassessed)
24. Species Grammysia rhomboides F. B. Meek, 1871 † (uncertain > unassessed)
25. Species Grammysia secunda J. Hall & Whitfield, 1869 † (uncertain > unassessed)
26. Species Grammysia teres Spriestersbach, 1915 † (uncertain > unassessed)
27. Species Grammysia ulrichi J. M. Clarke, 1899 † (uncertain > taxon inquirendum)
28. Species Grammysia ventricosa F. B. Meek, 1871 † (uncertain > unassessed)
29. Subgenus Grammysia (Grammysioidea) H. S. Williams & Breger, 1916 † accepted as Grammysioidea H. S. Williams & Breger, 1916 † (unaccepted > superseded rank)
    1. Species Grammysia (Grammysioidea) princiana H. S. Williams & Breger, 1916 † accepted as Grammysioidea princiana (H. S. Williams & Breger, 1916) † (unaccepted > superseded combination)
30. Subgenus Grammysia (Leptodomus) F. McCoy, 1844 † accepted as Leptodomus F. McCoy, 1844 † (unaccepted > superseded rank)
    1. Species Grammysia (Leptodomus) constricta J. Hall & Whitfield, 1869 † accepted as Myofossa constricta (J. Hall & Whitfield, 1869) † (unaccepted > superseded combination)
31. Species Grammysia alveata (Conrad, 1841) † accepted as Grammysioidea alveata (Conrad, 1841) † (unaccepted > superseded combination)
32. Species Grammysia arcuata (Conrad, 1841) † accepted as Grammysioidea arcuata (Conrad, 1841) † (unaccepted > superseded combination)
33. Species Grammysia catilloides Barrande, 1903 † accepted as Cuneamya catilloides (Barrande, 1903) † (unaccepted > superseded combination)
34. Species Grammysia chemungensis W. H. Pitt, 1874 † accepted as Grammysia elliptica J. Hall & Whitfield, 1869 † (unaccepted > junior subjective synonym)
35. Species Grammysia communis J. Hall, 1885 † accepted as Grammysioidea communis (J. Hall, 1885) † (unaccepted > superseded combination)
36. Species Grammysia duplicata J. Hall, 1885 † accepted as Grammysioidea duplicata (J. Hall, 1885) † (unaccepted > superseded combination)
37. Species Grammysia gardneri J. M. Clarke, 1899 † accepted as Grammysioidea gardneri (J. M. Clarke, 1899) † (unaccepted > superseded combination)
38. Species Grammysia hamiltonensis Verneuil, 1847 † accepted as Grammysia bisulcata (Conrad, 1838) † (unaccepted > junior subjective synonym)
39. Species Grammysia hannibalensis (Shumard, 1855) † accepted as Ectogrammysia hannibalensis (Shumard, 1855) † (unaccepted > superseded combination)
40. Species Grammysia juvenalis Hyde, 1953 † accepted as Ectogrammysia juvenalis (Hyde, 1953) † (unaccepted > superseded combination)
41. Species Grammysia lundi J. M. Clarke, 1899 † accepted as Grammysioidea lundi (J. M. Clarke, 1899) † (unaccepted > superseded combination)
42. Species Grammysia macroderma Eichwald, 1856 † accepted as Pterotheca macroderma (Eichwald, 1856) † (unaccepted > superseded combination)
43. Species Grammysia minor Walcott, 1884 † accepted as Grammysioidea minor (Walcott, 1884) † (unaccepted > superseded combination)
44. Species Grammysia omaliana (de Koninck, 1841) † accepted as Ectogrammysia omaliana (de Koninck, 1841) † (unaccepted > superseded combination)
45. Species Grammysia parallela J. Hall & Whitfield, 1869 † accepted as Pholadella parallela (J. Hall & Whitfield, 1869) † (unaccepted > superseded combination)
46. Species Grammysia pissisi J. M. Clarke, 1899 † accepted as Grammysioidea pissisi (J. M. Clarke, 1899) † (unaccepted > superseded combination)
47. Species Grammysia plena J. Hall, 1885 † accepted as Grammysioidea plena (J. Hall, 1885) † (unaccepted > superseded combination)
48. Species Grammysia subarcuata J. Hall & Whitfield, 1869 † accepted as Grammysioidea subarcuata (J. Hall & Whitfield, 1869) † (unaccepted > superseded combination)
49. Species Grammysia undata (J. Hall, 1883) † accepted as Grammysioidea undata (J. Hall, 1883) † (unaccepted > superseded combination)

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