Suborder Heterotrichina

Fam. Blepharismidae Jankowski in Small & Lynn, 1985

Fam. Chattonidiidae Villeneuve-Brachon, 1940

Fam. Climacostomidae Repak, 1972

Fam. Condylostomatidae Kahl in Doflein & Reichenow, 1929

Fam. Folliculinidae Dons, 1914

Fam. Peritromidae Stein, 1867

Fam. Spirostomidae Stein, 1867

Fam. Stentoridae Carus, 1863