1. Species Isoarca cordiformis (Zieten, 1833) †
2. Species Isoarca explicata G. Boehm, 1881 †
3. Species Isoarca globosa G. Boehm, 1883 †
4. Species Isoarca haueri G. Boehm, 1883 †
5. Species Isoarca heathi Ludbrook, 1966 †
6. Species Isoarca ovalis G. Boehm, 1883 †
7. Species Isoarca subspirata (Münster, 1837) †
8. Species Isoarca corrugata Tate, 1896 † accepted as Lophoconcha corrugata (Tate, 1896) † (unaccepted > superseded combination)
9. Species Isoarca crassatellaeformis Tate, 1896 † accepted as Alococoncha crassatellaeformis (Tate, 1896) † (unaccepted > superseded combination)
10. Species Isoarca eastii Tate, 1896 † accepted as Sthenodonta eastii (Tate, 1896) † (unaccepted > superseded combination)
11. Species Isoarca etheridgei Tate, 1896 † accepted as Sthenodonta etheridgei (Tate, 1896) † (unaccepted > superseded combination)
12. Species Isoarca opiformis Tate, 1896 † accepted as Eritropis opiformis (Tate, 1896) † (unaccepted > superseded combination)
13. Species Isoarca orbicularis Tate, 1896 † accepted as Johnmartinia orbicularis (Tate, 1896) † (unaccepted > superseded combination)
14. Species Isoarca wattii Tate, 1896 † accepted as Nuculites wattii (Tate, 1896) † (unaccepted > superseded combination)
15. Species Isoarca baylei Gemmellaro, 1875 † (uncertain > unassessed)
16. Species Isoarca faucheroni Riche, 1904 † (uncertain > unassessed)
17. Species Isoarca inflata Étallon, 1862 † (uncertain > unassessed)
18. Species Isoarca inflata Gemmellaro, 1875 † (uncertain > unassessed, junior homonym of Isoarca inflata Étallon, 1862)
19. Species Isoarca intermedia Gemmellaro, 1875 † (uncertain > unassessed)
20. Species Isoarca multistriata Étallon, 1863 † (uncertain > unassessed)
21. Species Isoarca scarburgensis Lycett, 1863 † (uncertain > unassessed)
22. Species Isoarca sublineata Étallon, 1863 † (uncertain > unassessed)
23. Species Isoarca umbonaria Gemmellaro, 1875 † (uncertain > unassessed)

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