| Feature | Urochordates | Cephalochordates |
|---|---|---|
| Examples | Ascidia, Salpa, Doliolum | Amphioxus (Branchiostoma) |
| Adult | Sedentary | Free swimming |
| Segmentation | Absent | Present |
| Notochord | Absent in adult | Present |
| Nerve Cord | Absent in adult | Present |
| Coelom | Absent | Present |
| Test | Present | Absent |
| Liver | Present | Midgut diverticulum |
| Heart | Present | Absent |
| Nephridia | Absent | Present |
| Sex | Bisexual | Unisexual |
| Metamorphosis | Retrogressive | Progressive |