Order Euplotida Small & Lynn, 1985

Suborder Discocephalina Wicklow, 1982

Fam. Discocephalidae Jankowski, 1979
Fam. Erionellidae Wicklow, 1982

Suborder Euplotina Small & Lynn, 1985

Fam. Aspidiscidae Ehrenberg, 1838
Fam. Certesiidae Borror & Hill, 1995
Fam. Euplotidae Ehrenberg, 1838
Fam. Gastrocirrhidae Fauré-Fremiet, 1961
Fam. Uronychiidae Jankowski, 1979