Order Vestibuliferida de Puytorac et al., 1974

Fam. Balantidiidae Reichenow in Doflein & Reichenow, 1929

Fam. Isotrichidae Bütschli, 1889

Fam. Paraisotrichidae da Cunha, 1917

Fam. Pycnotrichidae Poche, 1913

Incertae sedis in Order Vestibuliferida

- Buxtonella Jameson, 1926
- Muniziella da Fonseca, 1939
- Taliaferria Hegner & Rees, 1933

Fam. Protocaviellidae Grain in Corliss, 1979