Abyssoninoe Orensanz, 1990 (additional source)
Amphilepis Ljungman, 1867 (additional source)
Amphilepis norvegica (Ljungman, 1865) (additional source)
Amphipholis Ljungman, 1866 (additional source)
Amphipholis squamata (Delle Chiaje, 1828) (additional source)
Amphiura (Acrocnida) accepted as Acrocnida Gislén, 1926 (additional source)
Amphiura (Acrocnida) brachiata (Montagu, 1804) accepted as Acrocnida brachiata (Montagu, 1804) (additional source)
Amphiura (Ophiopeltis) securigera (Düben & Koren, 1846) (additional source)
Amphiura chiajei Forbes, 1843 (additional source)
Amphiura filiformis (O.F. Müller, 1776) (additional source)
Aora Krøyer, 1845 (additional source)
Aora typica Krøyer, 1845 (additional source)
Astropecten Gray, 1840 (additional source)
Astropecten irregularis (Pennant, 1777) (additional source)
Brissopsis L. Agassiz, 1840 (additional source)
Brissopsis lyrifera (Forbes, 1841) (additional source)
Cellaria Ellis & Solander, 1786 (additional source)
Crossaster Müller & Troschel, 1840 (additional source)
Crossaster papposus (Linnaeus, 1767) (additional source)
Cypridina (Vargula) norvegica (Baird, 1860) accepted as Vargula norvegica (Baird, 1860) (additional source)
Echinocardium Gray, 1825 (additional source)
Echinocardium cordatum (Pennant, 1777) (additional source)
Echinocardium flavescens (O.F. Müller, 1776) (additional source)
Echinocardium pennatifidum Norman, 1868 (additional source)
Echinocyamus van Phelsum, 1774 (additional source)
Echinocyamus pusillus (O.F. Müller, 1776) (additional source)
Echinus Linnaeus, 1758 (additional source)
Echinus acutus Lamarck, 1816 accepted as Gracilechinus acutus (Lamarck, 1816) (additional source)
Echinus elegans Düben & Koren, 1844 accepted as Gracilechinus elegans (Düben & Koren, 1844) (additional source)
Echinus esculentus Linnaeus, 1758 (additional source)
Eurycopidae Hansen, 1916 accepted as Eurycopinae Hansen, 1916 (additional source)
Exogone (Parexogone) longicirris (Webster & Benedict, 1844) accepted as Parexogone longicirris (Webster & Benedict, 1887) (additional source)
Fimbriosthenelais Pettibone, 1971 (additional source)
Fimbriosthenelais zetlandica (McIntosh, 1876) (additional source)
Glycera celtica O'Connor, 1987 (additional source)
Gyptis capensis (Day, 1963) accepted as Podarkeopsis capensis (Day, 1963) (basis of record)
Halecium Oken, 1815 (additional source)
Harmothoe (Harmothoe) ljungmani (Malmgren, 1867) accepted as Malmgrenia ljungmani (Malmgren, 1867) (source of synonymy)
Harmothoe fraserthomsoni McIntosh, 1897 (additional source)
Harmothoe marphysae McIntosh, 1876 accepted as Malmgrenia marphysae (McIntosh, 1876) (source of synonymy)
Henricia oculata (Pennant, 1777) (additional source)
Hydrallmania Hincks, 1868 (additional source)
Ilyarachnidae Hansen, 1916 accepted as Ilyarachninae Hansen, 1916 (additional source)
Nemertesia antennina (Linnaeus, 1758) (additional source)
Nemertesia ramosa (Lamarck, 1816) (additional source)
Nymphon grossipes (Fabricius, 1780) (additional source)
Nymphonidae Wilson, 1878 (basis of record)
Obelia bidentata Clark, 1875 (additional source)
Opercularella lacerata (Johnston, 1847) (additional source)
Ophiactis Lütken, 1856 (additional source)
Ophiactis balli (W. Thompson, 1840) (additional source)
Ophiocten Lütken, 1855 (additional source)
Ophiocten affinis (Lütken, 1858) (additional source)
Ophiopholis Müller & Troschel, 1842 (additional source)
Ophiopholis aculeata (Linnaeus, 1767) (additional source)
Ophiopsila Forbes, 1843 (additional source)
Ophiopsila aranea Forbes, 1843 (additional source)
Ophiothrix fragilis (Abildgaard in O.F. Müller, 1789) (additional source)
Ophiura Lamarck, 1801 (additional source)
Ophiura affinis Lütken, 1858 accepted as Ophiocten affinis (Lütken, 1858) (additional source)
Ophiura albida Forbes, 1839 (additional source)
Ophiura ophiura (Linnaeus, 1758) (additional source)
Ophiura texturata Lamarck, 1816 accepted as Ophiura ophiura (Linnaeus, 1758) (additional source)
Perigonimus repens (Wright, 1858) accepted as Leuckartiara octona (Fleming, 1823) (source of synonymy)
Plumularia Lamarck, 1816 (additional source)
Podarke pallida (Claparède, 1864) accepted as Oxydromus pallidus Claparède, 1864 (source of synonymy)
Polydora guillei Laubier & Ramos, 1974 accepted as Atherospio guillei (Laubier & Ramos, 1974) (additional source)
Prionospio malmgreni Claparède, 1869 (additional source)
Psammechinus L. Agassiz & Desor, 1846 (additional source)
Sertularella Gray, 1848 (additional source)
Sertularella gayi (Lamouroux, 1821) (additional source)
Sigalion squamosus Delle Chiaje, 1830 (additional source)
Spatangus Gray, 1825 (additional source)
Spatangus purpureus O.F. Müller, 1776 (additional source)
Sthenelais zetlandica McIntosh, 1876 accepted as Fimbriosthenelais zetlandica (McIntosh, 1876) (source of synonymy)
Stichastrella Verrill, 1914 (additional source)
Stichastrella rosea (O.F. Müller, 1776) (additional source)
Strongylocentrotus Brandt, 1835 (additional source)
Strongylocentrotus droebachiensis (O.F. Müller, 1776) (additional source)
Syllis amica Quatrefages, 1866 (additional source)
Synelmis klatti (Friedrich, 1950) accepted as Glyphohesione klatti Friedrich, 1950 (source of synonymy)
Thracia gracilis Jeffreys, 1865 (additional source)
Vargula Skogsberg, 1920 (additional source)

English squirrel's tail for Sertularia argentea Linnaeus, 1758

 Synonymy

 for Kefersteinia cirrhata (Keferstein, 1862)

Synonymised with Psamathe fusca Johnston, 1836 [details]