| Nominal Species (n = 3) | Present allocation (n = 2) | Ref. |
|---|---|---|
| Xenoturbella bocki Westblad, 1949 | Xenoturbella bocki | 85766 |
| Xenoturbella japonica Nakano et al., 2017 | Xenoturbella japonica | 116849 |
| Xenoturbella westbladi Israelsson, 1999 | Xenoturbella bocki | 85768 |