| Synonym | Author | CoL Status | Valid | Synonymy | Combination |
|---|---|---|---|---|---|
| Phascolosoma granulatum | non Leuckart, 1828 | misapplied name | No | misidentification |
misapplied |
| Phascolosoma heronis | Edmonds, 1956 | synonym | No | junior synonym |
original combination |
| Phascolosoma laeve | non Cuvier, 1830 | misapplied name | No | misidentification |
misapplied |
| Phascolosoma spinicauda | (de Quatrefages, 1865) | synonym | No | junior synonym |
new combination |
| Phascolosoma stephensoni | (Stephen, 1942) | accepted name | Yes | senior synonym |
new combination |
| Physcosoma lanzarotae | Harms, 1921 | synonym | No | junior synonym |
original combination |
| Physcosoma stephensoni | Stephen, 1942 | synonym | No | senior synonym |
original combination |
| Sipunculus spinicauda | de Quatrefages, 1865 | synonym | No | junior synonym |
original combination |