Amphiglena mediterranea (Leydig, 1851) (additional source)
Audouinia punctata (Grube, 1859) accepted as Timarete punctata (Grube, 1859) (basis of record)
Brada villosa (Rathke, 1843) accepted as Bradabyssa villosa (Rathke, 1843) (additional source)
Branchiomma vesiculosum (Montagu, 1815) accepted as Acromegalomma vesiculosum (Montagu, 1813) (additional source)
Capitella capitata (Fabricius, 1780) (additional source)
Chaetopterus variopedatus (Renier, 1804) (additional source)
Cirratulus tesselatus McIntosh, 1911 accepted as Aphelochaeta filiformis (Keferstein, 1862) (source of synonymy)
Clymene lombricoides Quatrefages, 1866 accepted as Euclymene lombricoides (Quatrefages, 1866) (source of synonymy)
Clymene santanderensis Rioja, 1917 accepted as Macroclymene santanderensis (Rioja, 1917) (additional source)
Ctenodrilus serratus (Schmidt, 1857) (additional source)
Dasybranchus caducus (Grube, 1846) (additional source)
Dasychone lucullana (Delle Chiaje, 1828) accepted as Branchiomma lucullanum (Delle Chiaje, 1828) (additional source)
Euclymene lombricoides (Quatrefages, 1866) (additional source)
Euclymene oerstedii (Claparède, 1863) (additional source)
Euclymene santanderensis (Rioja, 1917) accepted as Macroclymene santanderensis (Rioja, 1917) (additional source)
Flabelligera affinis M. Sars, 1829 (additional source)
Heteromastus filiformis (Claparède, 1864) (additional source)
Hypsicomus phaeotaenia (Schmarda, 1861) accepted as Notaulax phaeotaenia (Schmarda, 1861) (additional source)
Maldane glebifex Grube, 1860 (additional source)
Megalomma vesiculosum (Montagu, 1813) accepted as Acromegalomma vesiculosum (Montagu, 1813) (additional source)
Myxicola infundibulum (Montagu, 1808) (additional source)
Nerinides lamellata McIntosh, 1909 accepted as Scolelepis lamellata (McIntosh, 1909) (source of synonymy)
Notomastus profundus Eisig, 1887 (additional source)
Owenia fusiformis Delle Chiaje, 1844 (additional source)
Paraonis fulgens (Levinsen, 1884) (additional source)
Petaloproctus terricola Quatrefages, 1866 accepted as Petaloproctus terricolus Quatrefages, 1866 (additional source)
Polychaeta (identification resource)
Polydora caeca (Örsted, 1843) accepted as Dipolydora coeca (Örsted, 1843) (additional source)
Polydora ciliata (Johnston, 1838) (additional source)
Polymnia nebulosa (Montagu, 1819) accepted as Eupolymnia nebulosa (Montagu, 1819) (source of synonymy)
Polyophthalmus pictus (Dujardin, 1839) (additional source)
Potamilla reniformis (Bruguière, 1789) accepted as Pseudopotamilla reniformis (Bruguière, 1789) (taxonomy source)
Potamilla torelli Malmgren, 1866 (additional source)
Praxillella affinis (M. Sars in G.O. Sars, 1872) (additional source)
Scolelepis lamellata (McIntosh, 1909) (new combination reference)
Scoloplos armiger (Müller, 1776) (additional source)
Serpula vermicularis Linnaeus, 1767 (additional source)
Spio filicornis (Müller, 1776) (additional source)
Spio multioculata (Rioja, 1918) (additional source)
Spiophanes bombyx (Claparède, 1870) (additional source)
Sternaspis scutata (Ranzani, 1817) (source of synonymy)
Terebella Linnaeus, 1767 (additional source)