Spirostreptida

Adiaphorostreptidae

Atopogestidae

Cambalidae Bollman, 1893

Cambalopsidae Cook, 1895

Choctellidae Chamberlin & Hoffman, 1950

Epinannolenidae

Glyphiulidae

Harpagophoridae

Iulomorphidae

Julomorphidae

Odontopygidae

Pericambalidae

Physiostreptidae

Pseudonannolenidae Silvestri, 1895