| 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 | 44 |
| Named Used as Valid | Xenosiphon branchiatus |
| Locality | |
| Distribution | Ecuador, Costa Rica, USA (California, Florida), Panama, Puerto Rico. |