1. Genus Amblyonema Linstow, 1898
2. Genus Cruzia Travassos, 1917
3. Subfamily Kathlaniinae Lane, 1914
   1. Genus Cissophyllus Railliet & Henry, 1912
   2. Genus Falcaustra Lane, 1915
   3. Genus Kathlania Lane, 1914
   4. Genus Dibulbiger Caballero, 1935 accepted as Falcaustra Lane, 1915 (unaccepted > junior subjective synonym)
   5. Genus Florencioia Travassos, 1920 accepted as Falcaustra Lane, 1915 (unaccepted > junior subjective synonym)
   6. Genus Verlariocephalus Singh, 1958 accepted as Falcaustra Lane, 1915 (unaccepted > junior subjective synonym)
   7. Genus Zanclophorus Baylis & Daubney, 1922 accepted as Falcaustra Lane, 1915 (unaccepted > junior subjective synonym, Synonym )
4. Genus Myleusnema Moravec & Thatcher, 1996
5. Genus Oniscicula Schwenk, 1927
6. Genus Oxyascaris Travassos, 1920
7. Genus Pseudocruzia Wolfgang, 1953
8. Genus Pseudoxyascaris Uchida & Itagaki, 1979
9. Genus Spectatus Travassos, 1923
10. Genus Tonaudia Travassos, 1918
11. Genus Urodelnema Baker, 1981
12. Subfamily Cissophyllinae Yorke & Maplestone, 1926 accepted as Kathlaniinae Lane, 1914 (Synonym)
13. Genus Cordonema Baker, 1981 accepted as Urodelnema Baker, 1981 (unaccepted > junior homonym, Pre-occupied by Cordonema Schmidt & Kuntz, 1972)
14. Genus Nematoxynema Skrjabin & Schikhobalova, 1951 accepted as Falcaustra Lane, 1915 (unaccepted > junior subjective synonym)
15. Genus Oxysoma Schneider, 1866 accepted as Kathlania Lane, 1914 (Synonym )
16. Genus Paraoxyascaris Oliveira Rodrigues & Sodre Rodrigues, 1971 accepted as Oxyascaris Travassos, 1920 (unaccepted > junior subjective synonym)
17. Genus Pteroxyascaris Freitas, 1958 accepted as Oxyascaris Travassos, 1920 (unaccepted > junior subjective synonym)
18. Genus Spironoura Leidy, 1856 (uncertain)

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