Order Peniculida Fauré-Fremiet in Corliss, 1956

Suborder Frontoniina Small & Lynn, 1985

Fam. Clathrostomatidae Kahl, 1926
Fam. Frontoniidae Kahl, 1926
Fam. Lembadionidae Jankowski in Corliss, 1979
Fam. Maritujidae Jankowski in Small & Lynn, 1985
Fam. Stokesiidae Roque, 1961

Suborder Parameciina Jankowski in Small & Lynn, 1985

Fam. Parameciidae Dujardin, 1840
Fam. Neobursaridiidae Dragesco & Tuffrau, 1967
Fam. Urocentridae Claparède & Lachmann, 1858