| Echiuroidea | |
|---|---|
_PC301461.JPG)
| |
| Bonellia viridis (adult female) | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Annelida |
| Clade: | Pleistoannelida |
| Clade: | Sedentaria |
| Subclass: | Echiura |
| Order: | Echiuroidea Fisher, 1946 |
| Suborders | |
Echiuroidea is an order of annelids in the class Polychaeta.