| Synonym | Author | CoL Status | Valid | Synonymy | Combination |
|---|---|---|---|---|---|
| Phascolosoma violaceus | (Quatrefages, 1865) | synonym | No | junior synonym |
new combination |
| Siphonosoma crassum | Spengel, 1919 | synonym | No | junior synonym |
original combination |
| Siphonosoma parvum | Fischer, 1928 | synonym | No | junior synonym |
original combination |
| Siphonosoma vastum | (Selenka & Bülow, 1883) | accepted name | Yes | senior synonym |
change in rank |
| Siphonosoma vastum album | (Shipley, 1899) | synonym | No | junior synonym |
new combination |
| Siphonosoma vastum obscurum | (Shipley, 1899) | synonym | No | senior synonym |
new combination |
| Siphonosoma vastum vastum | (Selenka & Bulow, 1883) | synonym | No | senior synonym |
new combination |
| ! Siphonosoma vastus | (Selenka & Bulow, 1883) | synonym | No | senior synonym |
change in rank |
| Sipunculus vastus | Selenka & Bülow, 1883 | synonym | No | senior synonym |
original combination |
| Sipunculus violaceus | Quatrefages, 1865 | synonym | No | junior synonym |
original combination |