| Nominal Species (n = 78) | Present allocation (n = 27) | Ref. |
|---|---|---|
| Xenosiphon absconditus Saiz, 1984 | Xenosiphon absconditus | 19 |
| Sipunculus aeneus Baird, 1868 | Siphonosoma australe | 1840 |
| Sipunculus aequabilis Sluiter, 1902 | Sipunculus norvegicus | 1840 |
| Sipunculus amamiensis Ikeda, 1904 | Siphonosoma funafuti | 1840 |
| Sipunculus angasii Baird, 1868 | Sipunculus robustus | 1840 |
| Sipunculus angasoides Chen, 1963 | Sipunculus angasoides | 3477 |
| Phascolosoma australe Keferstein, 1865 | Siphonosoma australe | 1840 |
| Siphonosoma australe takatsukii Satô, 1935 | Siphonosoma australe | |
| Sipunculus balanophorus delle Chaiaje, 1823 | Sipunculus nudus | 1840 |
| Sipunculus billitonensis Sluiter, 1886 | Siphonosoma cumanense | 1840 |
| Sipunculus boholensis Selenke et al., 1883 | Siphonosoma boholense | |
| Xenosiphon branchiatus nudus Cutler & Cutler, 1985 | Xenosiphon absconditus | 1840 |
| Xenosiphon caribaeum Fischer, 1954 | Xenosiphon branchiatus | 1840 |
| Xenosiphon caribaeus Fischer, 1954 | Xenosiphon branchiatus | 1840 |
| Siphonosoma carolinense Fischer, 1928 | Siphonosoma cumanense | 1840 |
| Sipunculus claviger Sluiter, 1902 | Siphonosoma cumanense | 1840 |
| Siphonosoma crassum Spengel, 1919 | Siphonosoma vastum | 1840 |
| Phascolosoma cumanense Keferstein, 1867 | Siphonosoma cumanense | 1840 |
| Sipunculus cumanense opacus Selenke & Bülow, 1883 | Siphonosoma cumanense | 1840 |
| Siphonosoma cumanense var. yapense Satô, 1935 | Siphonosoma cumanense | 1840 |
| Sipunculus cumanensis vitreus Selenka & Bülow, 1883 | Siphonosoma cumanense | 1840 |
| Siphonosoma dayi Stephen, 1942 | Siphonosoma dayi | 1840 |
| Sipunculus deformis Baird, 1868 | Siphonosoma cumanense | 1840 |
| Sipunculus delphinus Murina, 1967 | Sipunculus nudus | 1840 |
| Sipunculus discrepans Sluiter, 1898 | Sipunculus indicus | 1840 |
| Lumbricus edulis Pallas, 1774 | Siphonosoma cumanense | 1840 |
| Siphonosoma eniwetoki Fisher, 1950 | Siphonosoma rotumanum | 1840 |
| Sipunculus eximioclatharus Baird, 1868 | Sipunculus nudus | 1840 |
| Siphonosoma formosum Satô, 1939 | Siphonosoma cumanense | 1840 |
| Sipunculus funafuti Shipley, 1898 | Siphonosoma funafuti | 1840 |
| Sipunculus galapagensis Fisher, 1947 | Sipunculus phalloides | 1840 |
| Sipunculus gigas de Quatrefages, 1865 | Sipunculus nudus | 1840 |
| Sipunculus gouldii Pourtalés, 1851 | Phascolopsis gouldii | 1840 |
| Sipunculus gravieri Hérubel, 1904 | Sipunculus robustus | 1840 |
| Siphonosoma hataii Satô, 1935 | Siphonosoma cumanense | 1840 |
| Siphonosoma hawaiense Edmonds, 1966 | Siphonosoma rotumanum | 1840 |
| Physocosoma hebes Sluiter, 1902 | Siphonosoma cumanense | 1840 |
| Sipunculus inclusus Sluiter, 1902 | Sipunculus phalloides | 1840 |
| Sipunculus indicus Peters, 1850 | Sipunculus indicus | 1840 |
| Xenosiphon indicus Johnson, 1969 | Sipunculus indicus | 1840 |
| Sipunculus infrons Sluiter, 1902 | Sipunculus norvegicus | 1840 |
| Siphonomecus ingens Fisher, 1947 | Siphonosoma ingens | 1840 |
| Siphonosoma koreae Satô, 1939 | Siphonosoma cumanense | 1840 |
| Sipunculus lomonossovi Murina, 1968 | Sipunculus lomonossovi | 19 |
| Sipunculus longipapillosus Murina, 1968 | Sipunculus longipapillosus | 19 |
| Sipunculus maoricus Benham, 1904 | Sipunculus mundanus | 1840 |
| Siphonosoma marchadi Stephen, 1960 | Siphonosoma cumanense | 1840 |
| Sipunculus marcusi Ditadi, 1976 | Sipunculus marcusi | 19 |
| Siphonosoma mourense Satô, 1930 | Siphonosoma mourense | 1840 |
| Siphonomecus multicinctus Fisher, 1947 | Siphonomecus multicinctus | 19 |
| Sipunculus multisulcatus Fischer, 1913 | Sipunculus phalloides | 1840 |
| Sipunculus mundanus Selenka & Bülow, 1883 | Sipunculus mundanus | 19 |
| Sipunculus mundanus var. branchiatus Fischer, 1895 | Xenosiphon branchiatus | 1840 |
| Siphonosoma nanhaiensis Li, 1985 | Siphonosoma rotumanum | 3477 |
| Sipunculus natans Cutler, E.B. | Sipunculus natans | 1871 |
| Sipunculus natans Fisher, 1954 | Sipunculus polymyotus | 1840 |
| Sipunculus nitidus Sluiter, 1900 | Sipunculus norvegicus | 1840 |
| Sipunculus norvegicus Danielssen, 1869 | Sipunculus norvegicus | 19 |
| Siphonosoma novaepommeraniae Cutler, E.B. | Siphonosoma novaepommeraniae | 1871 |
| Sipunculus novaepommeraniae Fischer, 1926 | Siphonosoma cumanense | 1840 |
| Sipunculus nudus Linnaeus, 1766 | Sipunculus nudus | 19 |
| Syrinx nudus Forbes, 1841 | Sipunculus nudus | 1840 |
| Siphonosoma parvum Fischer, 1928 | Siphonosoma vastum | 1840 |
| Siphonosoma pescadolense Satô, 1939 | Siphonosoma australe | 1840 |
| Lumbricus phalloides Pallas, 1774 | Sipunculus phalloides | 1840 |
| Sipunculus phalloides inclusus Sluiter, 1902 | Sipunculus phalloides | 1840 |
| Sipunculus polymyotus Fisher, 1947 | Sipunculus polymyotus | 19 |
| Sipunculus porrectus Selenka, 1888 | Sipunculus indicus | 1840 |
| Sipunculus priapuloides Koren & Danielssen, 1877 | Sipunculus norvegicus | 1840 |
| Sipunculus priapuloides var. americana Gerould, 1913 | Sipunculus norvegicus | 1840 |
| Sipunculus robustus Keferstein, 1865 | Sipunculus robustus | 19 |
| Phascolosoma semirugosum Grübe, 1868 | Siphonosoma cumanense | 1840 |
| Siphonosoma takatsukii Satô, 1935 | Siphonosoma australe | 1840 |
| Syrinx tesselatus Rafinesque, 1814 | Sipunculus nudus | 1840 |
| Sipunculus titubans Selenka & Bülow, 1883 | Sipunculus nudus | 1840 |
| Sipunculus titubans Cutler, E.B. | Sipunculus titubans | 1871 |
| Sipunculus vastus Selenka & Bülow, 1883 | Siphonosoma vastum | 1840 |
| Sipunculus violaceus Quatrefages, 1865 | Siphonosoma vastum | 1840 |