Order Chlamydodontida Deroux, 1976

Fam. Chilodonellidae Deroux, 1970
Fam. Chitonellidae Small & Lynn, 1985
Fam. Chlamydodontidae Stein, 1859
Fam. Gastronautidae Deroux, 1994
Fam. Kryoprorodontidae Alekperov & Mamajeva, 1992
Fam. Lynchelliae Jankowski, 1968