| Citation | Cutler, E.B., 1994 The Sipuncula. Their systematics, biology and evolution. Ithaca: Comstock publishing Associates, 433 p. |
| Ref. | 1840 Cutler, E.B., 1994 |
| Page | 127 |
| Named Used as Valid | Phascolion caupo |
| Locality | |
| Distribution | Southeastern USA, southern Spain. |