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. 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 superseded rank)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 superseded combination)
9. 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 superseded rank)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 superseded combination)
10. Species Grammysia alveata (Conrad, 1841) † accepted as Grammysioidea alveata (Conrad, 1841) † (unaccepted > superseded combination)
11. Species Grammysia arcuata (Conrad, 1841) † accepted as Grammysioidea arcuata (Conrad, 1841) † (unaccepted > superseded combination)
12. Species Grammysia catilloides Barrande, 1903 † accepted as Cuneamya catilloides (Barrande, 1903) † (unaccepted > superseded combination)
13. Species Grammysia chemungensis W. H. Pitt, 1874 † accepted as Grammysia elliptica J. Hall & Whitfield, 1869 † (unaccepted > junior subjective synonym)
14. Species Grammysia communis J. Hall, 1885 † accepted as Grammysioidea communis (J. Hall, 1885) † (unaccepted > superseded combination)
15. Species Grammysia duplicata J. Hall, 1885 † accepted as Grammysioidea duplicata (J. Hall, 1885) † (unaccepted > superseded combination)
16. Species Grammysia hamiltonensis Verneuil, 1847 † accepted as Grammysia bisulcata (Conrad, 1838) † (unaccepted > junior subjective synonym)
17. Species Grammysia hannibalensis (Shumard, 1855) † accepted as Grammysioidea hannibalensis (Shumard, 1855) † (unaccepted > superseded combination)
18. Species Grammysia minor Walcott, 1884 † accepted as Grammysioidea minor (Walcott, 1884) † (unaccepted > superseded combination)
19. Species Grammysia plena J. Hall, 1885 † accepted as Grammysioidea plena (J. Hall, 1885) † (unaccepted > superseded combination)
20. Species Grammysia subarcuata J. Hall & Whitfield, 1869 † accepted as Grammysioidea subarcuata (J. Hall & Whitfield, 1869) † (unaccepted > superseded combination)
21. Species Grammysia undata (J. Hall, 1883) † accepted as Grammysioidea undata (J. Hall, 1883) † (unaccepted > superseded combination)
22. Species Grammysia dubia C. L. Fenton & M. A. Fenton, 1924 † (uncertain > unassessed)
23. Species Grammysia glabra J. Hall, 1885 † (uncertain > unassessed)
24. Species Grammysia globosa J. Hall & Whitfield, 1869 † (uncertain > unassessed)
25. Species Grammysia lirata J. Hall & Whitfield, 1869 † (uncertain > unassessed)
26. Species Grammysia obsoleta J. Hall & Whitfield, 1869 † (uncertain > unassessed)
27. Species Grammysia ovata J. Hall, 1885 † (uncertain > unassessed)
28. Species Grammysia parallela J. Hall & Whitfield, 1869 † (uncertain > unassessed)
29. Species Grammysia praecursor J. Hall & Whitfield, 1869 † (uncertain > unassessed)
30. Species Grammysia secunda J. Hall & Whitfield, 1869 † (uncertain > unassessed)
31. Species Grammysia teres Spriestersbach, 1915 † (uncertain > unassessed)

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