Sipuncula
Aspidosiphoniformes
| Family | Common Name | Selected Genus and Species | Image |
| Aspidosiphonidae | Peanut worms | Lithacrosiphon cristatus |  |
Order: Golfingiida
| Family | Common Name | Selected Genus and Species | Image |
| Golfingiidae | Peanut worms | Thysanocardia nigra |  |
| Phascolionidae | Peanut worms | Phascolion tuberculosum |  |
| Sipunculidae | Peanut worms | Sipunculus nudus |  |
| Themistidae | Peanut worms | Themiste alutacea |  |
Order: Phascolosomatida
| Family | Common Name | Selected Genus and Species | Image |
| Phascolosomatidae | Peanut worms | Phascolosoma nigrescens |  |