1. Subfamily Ilyophinae Jordan & Davis, 1891
   1. Genus Atractodenchelys Robins & Robins, 1970
   2. Genus Branchenchelys Tighe & Kodeeswaran, 2025
   3. Genus Dysomma Alcock, 1889
   4. Genus Dysommina Ginsburg, 1951
   5. Genus Ilyophis Gilbert, 1891
   6. Genus Linkenchelys Smith, 1989
   7. Genus Meadia Böhlke, 1951
   8. Genus Thermobiotes Geistdoerfer, 1991
   9. Genus Dysommopsis Alcock, 1891 accepted as Dysomma Alcock, 1889
   10. Genus Media accepted as Meadia Böhlke, 1951 (misspelling)
   11. Genus Nettodarus Whitley, 1951 accepted as Dysomma Alcock, 1889 (synonym)
   12. Genus Sinomyrus Lin, 1933 accepted as Dysomma Alcock, 1889
   13. Genus Todarus Grassi & Calandruccio, 1896 accepted as Dysomma Alcock, 1889
2. Subfamily Simenchelyinae Gill, 1879
   1. Genus Simenchelys Gill, 1879
   2. Genus Conchognathus Collett, 1889 accepted as Simenchelys Gill, 1879 (unaccepted > junior subjective synonym)
   3. Genus Gymnosimenchelys Tanaka, 1908 accepted as Simenchelys Gill, 1879 (unaccepted > junior subjective synonym)
3. Subfamily Synaphobranchinae Johnson, 1862
   1. Genus Diastobranchus Barnard, 1923
   2. Genus Haptenchelys Robins & Martin, 1976
   3. Genus Histiobranchus Gill, 1883
   4. Genus Synaphobranchus Johnson, 1862
   5. Genus Nettophichthys Holt, 1891 accepted as Synaphobranchus Johnson, 1862 (unaccepted > junior subjective synonym)
   6. Genus Synapobranchus Johnson, 1862 accepted as Synaphobranchus Johnson, 1862 (unaccepted > misspelling - incorrect subsequent spelling)
4. Subfamily Dysommatinae Gill, 1893 accepted as Ilyophinae Jordan & Davis, 1891 (unaccepted > junior subjective synonym)
5. Subfamily Simenchelinae Gill, 1879 accepted as Simenchelyinae Gill, 1879 (unaccepted > misspelling - incorrect subsequent spelling)

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