Orde Rhabdocoela

• Byrsophlebidae [familie]
• Cicerinidae [familie]
• Dalyelliidae [familie]
• Placorhynchidae [familie]
• Polycystididae [familie]
• Promesostomidae [familie]
• Provorticidae [familie]
• Trigonostomidae [familie]
• Typhloplanidae [familie]