Between brackets is the number of accepted extant species
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- Strepsiptera (603)
- Superfamily Elenchoidea Pierce, 1908 accepted as Elenchidae Perkins, 1905
- Superfamily Halictophagoidea Pierce, 1908 accepted as Halictophagidae Perkins, 1905
- Superfamily Mengeoidea Pierce, 1908 accepted as Mengeidae Pierce, 1908 †
- Superfamily Xenoidea Pierce, 1908 accepted as Xenidae Saunders, 1872
- Family Bahiaxenidae Bravo, Pohl, Silva-Neto & Beutel, 2009 (1)
- Family Bohartillidae Kinzelbach, 1969 (1)
- Family Corioxenidae Kinzelbach, 1970 (46)
- Family Cretostylopidae Kathirithamby & Engel, 2014 †
- Family Dioxoceridae Pierce, 1908
- Family Elenchidae Perkins, 1905 (28)
- Family Halictophagidae Perkins, 1905 (133)
- Family Hylechthridae Pierce, 1908
- Family Kinzelbachillidae Pohl & Beutel, 2016 † accepted as Phthanoxenidae Engel & Huang, 2016 †
- Family Lychnocolacidae Kathirithamby & Engel, 2014 (23)
- Family Mengeidae Pierce, 1908 † (1)
- Family Mengenillidae Hofeneder, 1910 (14)
- Family Myrmecolacidae Saunders, 1872 (86)
- Family Phthanoxenidae Engel & Huang, 2016 †
- Family Protoxenidae Pohl, Beutel & Kinzelbach, 2005 †
- Family Stylopidae Kirby, 1813 (150)
- Family Xenidae Saunders, 1872 (120)
- Genus Acroschismus Pierce, 1908 accepted as Xenos Rossius, 1793
- Genus Belonogastechthrus Pierce, 1911 accepted as Xenos Rossius, 1793
- Genus Brasixenos Kogan & Oliveira, 1966 accepted as Xenos Rossius, 1793
- Species Brasixenos acinctus Kogan & Oliveira, 1966 accepted as Xenos acinctus (Kogan & Oliveira, 1966)
- Species Brasixenos bahiensis Kogan & Oliveira, 1966 accepted as Xenos bahiensis (Kogan & Oliveira, 1966)
- Species Brasixenos brasiliensis Kogan & Oliveira, 1966 accepted as Xenos brasiliensis (Kogan & Oliveira, 1966)
- Species Brasixenos fluminensis Kogan & Oliveira, 1966 accepted as Xenos fluminensis (Kogan & Oliveira, 1966)
- Species Brasixenos myrapetrus Trois, 1988 accepted as Xenos myrapetrus (Trois, 1988)
- Species Brasixenos occidentalis Kogan & Oliveira, 1966 accepted as Xenos occidentalis (Kogan & Oliveira, 1966)
- Species Brasixenos zilkani Kogan & Oliveira, 1966 accepted as Xenos zilkani (Kogan & Oliveira, 1966)
- Genus Clypoxenos Bréthes, 1923 accepted as Xenos Rossius, 1793
- Genus Eupathocera Pierce, 1908 accepted as Paraxenos Saunders, 1872
- Genus Hamilops Pierce, 1908 accepted as Paraxenos Saunders, 1872
- Genus Leionotoxenos Pierce, 1909 accepted as Pseudoxenos Saunders, 1872
- Genus Macroxenos Schultze, 1925 accepted as Pseudoxenos Saunders, 1872
- Genus Montezumiaphila Bréthes, 1923 accepted as Pseudoxenos Saunders, 1872
- Genus Ophthalmochlus Pierce, 1908 accepted as Paraxenos Saunders, 1872
- Genus Paraxenos Saunders, 1872 (46)
- Genus Pseudoxenos Saunders, 1872 (33)
- Genus Sceliphronechthrus Pierce, 1909 accepted as Paraxenos Saunders, 1872
- Genus Vespaexenos Pierce, 1909 accepted as Xenos Rossius, 1793
- Genus Xenos Rossius, 1793 (41)