1. Genus Boreacanthus R. N. Clark, 2023
2. Subfamily Mopaliinae Dall, 1889
   1. Genus Amicula J. E. Gray, 1847
   2. Genus Dendrochiton S. S. Berry, 1911
   3. Genus Katharina Gray, 1847
   4. Genus Mopalia Gray, 1847
   5. Genus Nuttallochiton Plate, 1899
   6. Genus Placiphorella Dall, 1879
   7. Genus Placiphorina Kaas & Van Belle, 1994
   8. Genus Plaxiphora J. E. Gray, 1847
   9. Genus Amycula J. E. Gray, 1847 accepted as Amicula J. E. Gray, 1847 (unaccepted > misspelling - incorrect subsequent spelling)
   10. Genus Frembleya H. Adams, 1867 accepted as Plaxiphora (Frembleya) H. Adams, 1867 represented as Plaxiphora J. E. Gray, 1847
   11. Genus Kopionella Ashby, 1919 accepted as Plaxiphora J. E. Gray, 1847 (synonym)
   12. Genus Notochiton Thiele, 1906 accepted as Nuttallochiton Plate, 1899
   13. Genus Nuttalochiton Plate, 1899 accepted as Nuttallochiton Plate, 1899 (original combination)
   14. Genus Osteochiton Dall, 1886 accepted as Mopalia Gray, 1847
   15. Genus Placophora A. E. Verrill & S. Smith, 1882 accepted as Placiphorella Dall, 1879 (junior synonym and unjustified emendation of Plaxiphora)
   16. Genus Tomochiton P. Fischer, 1885 accepted as Boreochiton G. O. Sars, 1878 (synonym of Boreochiton, based on the same type species)
   17. Genus Trochodochiton Rochebrune, 1884 accepted as Placiphorella Dall, 1879 (synonym)
3. Genus Placophoropsis Pilsbry, 1893
4. Genus Aerilamma Hull, 1924 accepted as Plaxiphora J. E. Gray, 1847 (unaccepted > junior subjective synonym)
5. Genus Chlamydochiton Dall, 1878 accepted as Amicula J. E. Gray, 1847 (unaccepted > junior subjective synonym)
6. Genus Diaphoroplax Iredale, 1914 accepted as Plaxiphora J. E. Gray, 1847
7. Genus Euplaxiphora Shuttleworth, 1853 accepted as Plaxiphora J. E. Gray, 1847
8. Genus Guildingia P. P. Carpenter, 1882 accepted as Plaxiphora (Guildingia) P. P. Carpenter, 1882 accepted as Plaxiphora J. E. Gray, 1847
9. Genus Hachijomopalia Is. Taki, 1954 accepted as Plaxiphora J. E. Gray, 1847 (synonym)
10. Subfamily Katharininae Yakovleva, 1952 accepted as Mopaliinae Dall, 1889
11. Genus Langfordiella Dall, 1925 accepted as Placiphorella Dall, 1879 (junior synonym)
12. Genus Maorichiton Iredale, 1914 accepted as Plaxiphora J. E. Gray, 1847 (synonym)
13. Genus Poneroplax Iredale, 1914 accepted as Plaxiphora J. E. Gray, 1847 (unaccepted > junior subjective synonym)
14. Genus Stimpsoniella P. P. Carpenter, 1873 accepted as Amicula J. E. Gray, 1847 (unaccepted > junior subjective synonym)
15. Genus Streptochiton Dall, 1879 accepted as Frembleya H. Adams, 1867 accepted as Plaxiphora (Frembleya) H. Adams, 1867 represented as Plaxiphora J. E. Gray, 1847 (unaccepted > nomen nudum)
16. Genus Symmetrogephyrus Middendorff, 1847 accepted as Amicula J. E. Gray, 1847 (unaccepted > junior subjective synonym)
17. Genus Vaferichiton Iredale & Hull, 1932 accepted as Plaxiphora J. E. Gray, 1847 (synonym)

 The webpage text is licensed under a Creative Commons Attribution 4.0 License