1. Subgenus Alasmodonta (Decurambis) Rafinesque, 1831 accepted as Alasmidonta (Decurambis) Rafinesque, 1831 represented as Alasmidonta Say, 1818
   1. Species Alasmodonta (Decurambis) atropurpurea (Rafinesque, 1831) accepted as Alasmidonta atropurpurea (Rafinesque, 1831)
2. Subgenus Alasmodonta (Pegias) C. T. Simpson, 1900 accepted as Pegias C. T. Simpson, 1900 (unaccepted > misspelling)
   1. Species Alasmodonta (Pegias) fabula (I. Lea, 1838) accepted as Pegias fabula (I. Lea, 1838) (recombination)
3. Subgenus Alasmodonta (Pressodonta) C. T. Simpson, 1900 accepted as Alasmidonta (Pressodonta) C. T. Simpson, 1900 represented as Alasmidonta Say, 1818
   1. Species Alasmodonta (Pressodonta) calceola (I. Lea, 1830) accepted as Alasmidonta viridis (Rafinesque, 1820) (incorrect gender ending, species epithet is a noun)
4. Subgenus Alasmodonta (Prolasmidonta) Ortmann, 1914 accepted as Alasmidonta (Prolasmidonta) Ortmann, 1914 represented as Alasmidonta Say, 1818
   1. Species Alasmodonta (Prolasmidonta) heterodon (I. Lea, 1829) accepted as Alasmidonta heterodon (I. Lea, 1829)
5. Subgenus Alasmodonta (Rugifera) C. T. Simpson, 1900 accepted as Alasmidonta (Rugifera) C. T. Simpson, 1900 represented as Alasmidonta Say, 1818 (unaccepted > misspelling)
6. Species Alasmodonta ambigua Say, 1825 accepted as Simpsonaias ambigua (Say, 1825)
7. Species Alasmodonta arcuata Barnes, 1823 accepted as Margaritifera margaritifera (Linnaeus, 1758)
8. Species Alasmodonta berlani Bourguignat, 1870 accepted as Pseudanodonta complanata (Rossmässler, 1835) (a junior synonym)
9. Species Alasmodonta complanata Barnes, 1823 accepted as Lasmigona complanata (Barnes, 1823)
10. Species Alasmodonta confragosa Say, 1829 accepted as Arcidens confragosus (Say, 1829) (original combination)
11. Species Alasmodonta crispata Mousson, 1849 accepted as Pseudodon vondembuschianus vondembuschianus (I. Lea, 1840) (unaccepted > junior subjective synonym)
12. Species Alasmodonta edentula Say, 1829 accepted as Strophitus undulatus (Say, 1817)
13. Species Alasmodonta impressa J. G. Anthony, 1865 accepted as Lasmigona holstonia (I. Lea, 1838)
14. Species Alasmodonta marginata Say, 1818 accepted as Alasmidonta marginata Say, 1818 (subsequent misspelling of original genus name, Alasmidonta Say, 1818)
15. Species Alasmodonta nicobarica Mörch, 1872 accepted as Pseudodon nicobaricus (Mörch, 1872) (unaccepted > superseded combination)
16. Species Alasmodonta penchinati Bourguignat, 1870 accepted as Pseudanodonta complanata (Rossmässler, 1835) (a junior synonym)
17. Species Alasmodonta radiata Conrad, 1834 accepted as Anodontoides radiatus (Conrad, 1834) accepted as Strophitus radiatus (Conrad, 1834)
18. Species Alasmodonta rugosa Barnes, 1823 accepted as Lasmigona costata (Rafinesque, 1820)
19. Species Alasmodonta sculptilis Say, 1829 accepted as Alasmidonta undulata (Say, 1817)
20. Species Alasmodonta truncata (B. H. Wright, 1898) accepted as Alasmidonta marginata Say, 1818 (subsequent misspelling of original genus name, Alasmidonta Say, 1818; junior synonym)
21. Species Alasmodonta undulata (Say, 1817) accepted as Alasmidonta undulata (Say, 1817)
22. Species Alasmodonta vondembuschiana (I. Lea, 1840) accepted as Monodontina vondembuschiana (I. Lea, 1840) accepted as Pseudodon vondembuschianus (I. Lea, 1840) (unaccepted > superseded combination)
23. Species Alasmodonta zollingeri Mousson, 1849 accepted as Pseudodon vondembuschianus vondembuschianus (I. Lea, 1840)

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