==Subdivisions==**Family Aeolosomatidae**Family Arenicolidae**Family Capitellidae**Family Cossunidae**Family Maldanidae**Family Opheliidae**Family Orbiniidae**Family Paraonidae**Family Parergodrilidae**Family Potamodrilidae**Family Psammodrilidae**Family Questidae**Family Scalibregmatidae==References==
* Aeolosomatidae* Arenicolidae* Capitellidae* Cossunidae* Maldanidae* Opheliidae* Orbiniidae* Paraonidae* Parergodrilidae* Potamodrilidae* Psammodrilidae* Questidae* Scalibregmatidae