Abyssoninoe Orensanz, 1990 (additional source)
Aglaophenia Lamouroux, 1812 (additional source)
Allantis Hérouard, 1902 accepted as Mesothuria Ludwig, 1894 (additional source)
Amphipholis Ljungman, 1866 (additional source)
Amphipholis squamata (Delle Chiaje, 1828) (additional source)
Amphipholis torelli Ljungman, 1872 (additional source)
Amphiura (Ophiopeltis) securigera (Düben & Koren, 1846) (additional source)
Amphiura borealis (G.O. Sars, 1872) (additional source)
Amphiura sundevalli (Müller & Troschel, 1842) (additional source)
Ankyroderma Ludwig, 1890, non Danielssen & Koren, 1879 accepted as Molpadia Cuvier, 1817 (additional source)
Ankyroderma jeffreysii Danielssen & Koren, 1881 accepted as Molpadia jeffreysi (Danielssen & Koren, 1881) accepted as Molpadia borealis Sars M, 1859 (additional source)
Antedonidae Norman, 1865 (additional source)
Arachnida (basis of record)
Bathybiaster Danielssen & Koren, 1883 (additional source)
Bathybiaster vexillifer (Wyville Thomson, 1873) (additional source)
Bathycrinidae Bather, 1899 (additional source)
Bathycrinus Thomson, 1872 (additional source)
Bathycrinus carpenterii (Danielssen & Koren, 1877) (additional source)
Benthopectinidae Verrill, 1899 (additional source)
Ceramaster Verrill, 1899 (additional source)
Ceramaster granularis (Retzius, 1783) (additional source)
Chalinidae Gray, 1867 (additional source)
Chiridota discolor Eschscholtz, 1829 (basis of record)
Crossaster Müller & Troschel, 1840 (additional source)
Crossaster papposus (Linnaeus, 1767) (additional source)
Crossaster squamatus (Döderlein, 1900) (additional source)
Ctenodiscus Müller & Troschel, 1842 (additional source)
Ctenodiscus crispatus (Bruzelius, 1805) (additional source)
Dendrochirotida (additional source)
Dynamena Lamouroux, 1812 (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 esculentus Linnaeus, 1758 (additional source)
Eudendrium ramosum Van Beneden, 1844 accepted as Bougainvillia muscus (Allman, 1863) (basis of record)
Gellius angulatus (Bowerbank, 1866) accepted as Haliclona (Gellius) angulata (Bowerbank, 1866) (source of synonymy)
Gorgonocephalus Leach, 1815 (additional source)
Gorgonocephalus arcticus Leach, 1819 (additional source)
Gorgonocephalus eucnemis (Müller & Troschel, 1842) (additional source)
Gorgonocephalus lamarckii (Müller & Troschel, 1842) (additional source)
Halecium Oken, 1815 (additional source)
Hathrometra AH Clark, 1908 (additional source)
Hathrometra sarsii (Düben & Koren, 1846) accepted as Hathrometra tenella (Retzius, 1783) (additional source)
Heliometra AH Clark, 1907 (additional source)
Heliometra glacialis (Owen, 1833 ex Leach MS) (additional source)
Henricia eschrichti (Müller & Troschel, 1842) (additional source)
Henricia lisa A.H. Clark, 1949 (additional source)
Henricia lisa ingolfi Madsen, 1987 (additional source)
Henricia perforata (O.F. Müller, 1776) (additional source)
Henricia pertusa (O.F. Müller, 1776) (additional source)
Henricia sanguinolenta (O.F. Müller, 1776) (additional source)
Hippasteria Gray, 1840 (additional source)
Hippasteria phrygiana (Parelius, 1768) (additional source)
Hydrallmania Hincks, 1868 (additional source)
Hypodontolaimus buetschlii Filipjev, 1918 accepted as Hypodontolaimus balticus (G. Schneider, 1906) Filipjev, 1918 (source of synonymy)
Icasterias Fisher, 1923 (additional source)
Icasterias panopla (Stuxberg, 1879) (additional source)
Ilyarachna hirticeps G. O. Sars, 1870 (additional source)
Labidoplax Östergren, 1898 (additional source)
Labidoplax buskii (MacIntosh, 1866) (additional source)
Labidoplax digitata (Montagu, 1815) accepted as Oestergrenia digitata (Montagu, 1815) (additional source)
Leptychaster E. A. Smith, 1876 (additional source)
Leptychaster arcticus (M. Sars, 1851) (additional source)
Lophaster Verrill, 1878 (additional source)
Lophaster furcifer (Düben & Koren, 1846) (additional source)
Mesothuria Ludwig, 1894 (additional source)
Mesothuria (Allantis) intestinalis (Ascanius, 1805) Östergren, 1896 accepted as Mesothuria intestinalis (Ascanius, 1805) (additional source)
Myriotrochus Steenstrup, 1851 (additional source)
Myriotrochus eurycyclus Heding, 1935 (additional source)
Myriotrochus rinkii Steenstrup, 1851 (additional source)
Myriotrochus theeli Östergren, 1905 (additional source)
Nemertesia antennina (Linnaeus, 1758) (additional source)
Nymphon elegans Hansen, 1887 (additional source)
Nymphon grossipes (Fabricius, 1780) (additional source)
Nymphon hirtipes Bell, 1855 (additional source)
Nymphon leptocheles Sars, 1888 (additional source)
Nymphon longimanum Sars, 1888 (additional source)
Nymphon longitarse Krøyer, 1844 (additional source)
Nymphon macronyx Sars, 1877 (additional source)
Nymphon macrum Wilson, 1880 (basis of record)
Nymphon megalops Sars, 1877 (additional source)
Nymphon microrhynchum G.O. Sars, 1888 (additional source)
Nymphon mixtum Krøyer, 1844 accepted as Nymphon grossipes (Fabricius, 1780) (basis of record)
Nymphon serratum G. O. Sars, 1879 (additional source)
Nymphon sluiteri Hoek, 1901 (additional source)
Nymphon stroemi Krøyer, 1844 (additional source)
Nymphon tenellum (Sars, 1888) (additional source)
Nymphonidae Wilson, 1878 (basis of record)
Obelia flabellata (Hincks, 1866) accepted as Obelia longissima (Pallas, 1766) (basis of record)
Obelia flabellata (Hincks, 1866) accepted as Obelia longissima (Pallas, 1766) (source of synonymy)
Oestergrenia Heding, 1931 (additional source)
Oestergrenia digitata (Montagu, 1815) (basis of record)
Opercularella lacerata (Johnston, 1847) (additional source)
Ophiacantha Müller & Troschel, 1842 (additional source)
Ophiacantha abyssicola G.O. Sars, 1872 (additional source)
Ophiacantha bidentata (Bruzelius, 1805) (additional source)
Ophiacantha spectabilis G.O. Sars, 1872 (additional source)
Ophiactis Lütken, 1856 (additional source)
Ophiactis abyssicola (M. Sars, 1861) (additional source)

English squirrel's tail for Sertularia argentea Linnaeus, 1758