Syllis hyalina Grube, 1863 (additional source)

North Sea for Aphrodita aculeata Linnaeus, 1758  (doubtful)
North Sea for Arenicola marina (Linnaeus, 1758) 
North Sea for Capitella capitata (Fabricius, 1780) 
North Sea for Chaetopterus variopedatus (Renier, 1804) 
North Sea for Chaetozone setosa Malmgren, 1867 
North Sea for Eone nordmanni Malmgren, 1866 
North Sea for Ephesia gracilis Rathke, 1843 
North Sea for Eteone picta Quatrefages, 1866 
North Sea for Eulalia sanguinea Örsted, 1843 
North Sea for Eulalia viridis (Linnaeus, 1767) 
North Sea for Gattyana cirrhosa (Pallas, 1766) 
North Sea for Glycera alba (O.F. Müller, 1776) 
North Sea for Glycera capitata Örsted, 1842 
North Sea for Glycera convoluta Keferstein, 1862 
North Sea for Glycera lapidum Quatrefages, 1866 
North Sea for Glycera rouxii Audouin & Milne Edwards, 1833 
North Sea for Harmothoe longisetis (Grube, 1863) 
North Sea for Lanice conchilega (Pallas, 1766) 
North Sea for Marphysa sanguinea (Montagu, 1813) 
North Sea for Nephtys caeca (Fabricius, 1780) 
North Sea for Nephtys cirrosa Ehlers, 1868 
North Sea for Nephtys hombergii Savigny in Lamarck, 1818 
North Sea for Nephtys longosetosa Örsted, 1842 
North Sea for Nereis longissima Johnston, 1840 
North Sea for Nereis pelagica Linnaeus, 1758 
North Sea for Nerine bonnieri Mesnil, 1896 
North Sea for Notomastus latericeus Sars, 1851 
North Sea for Ophelia limacina (Rathke, 1843) 
North Sea for Owenia fusiformis Delle Chiaje, 1844 
North Sea for Pectinaria (Lagis) koreni (Malmgren, 1866) 
North Sea for Pholoe minuta (Fabricius, 1780) 
North Sea for Phyllodoce (Anaitides) groenlandica Örsted, 1842 
North Sea for Phyllodoce laminosa Savigny in Lamarck, 1818 
North Sea for Poecilochaetus serpens Allen, 1904 
North Sea for Polydora ciliata (Johnston, 1838) 
North Sea for Pomatoceros triqueter (Linnaeus, 1758) 
North Sea for Sabellaria spinulosa (Leuckart, 1849) 
North Sea for Scolelepis fuliginosa (Claparède, 1868) 
North Sea for Scoloplos armiger (Müller, 1776) 
North Sea for Spio filicornis (Müller, 1776) 
North Sea for Spiophanes bombyx (Claparède, 1870) 
North Sea for Sthenelais boa (Johnston, 1833) 
North Sea for Syllis hyalina Grube, 1863 
North Sea for Thelepus cincinnatus (Fabricius, 1780) 
North Sea for Tomopteris helgolandica Greeff, 1879