Actinothoe laceratus (Dalyell, 1848) accepted as Sagartiogeton laceratus (Dalyell, 1848) accepted as Sagartia lacerata (Dalyell, 1848) (basis of record)
Adamsia palliata (Bohadsch, 1761) accepted as Adamsia palliata (Fabricius, 1779) accepted as Calliactis palliata (Müller, 1776) (additional source)
Amphinema Haeckel, 1879 (additional source)
Bimeria nutans (Wright, 1859) accepted as Garveia nutans Wright, 1859 (basis of record)
Bimeria vestita Wright, 1859 (additional source)
Campanularia spinulosa Bale, 1888 accepted as Obelia spinulosa (Bale, 1888) (basis of record)
Campanularia verticillata (Linnaeus, 1758) accepted as Rhizocaulus verticillatus (Linnaeus, 1758) (basis of record)
Campanulina acuminata (Alder, 1857) accepted as Aequorea vitrina Gosse, 1853 (basis of record)
Campanulina repens Allman, 1864 accepted as Phialella quadrata (Forbes, 1848) (basis of record)
Cordylophora Allman, 1844 (additional source)
Cordylophora caspia (Pallas, 1771) (additional source)
Cosmetira brownei (Kramp, 1930) accepted as Mitrocomella brownei (Kramp, 1930) (basis of record)
Cosmetira polydiademata (Romanes, 1876) accepted as Mitrocomella polydiademata (Romanes, 1876) (basis of record)
Cuspidella Hincks, 1866 (additional source)
Cuspidella costata Hincks, 1868 accepted as Laodicea undulata (Forbes & Goodsir, 1853) (additional source)
Dicoryne Allman, 1859 (additional source)
Dicoryne conferta (Alder, 1856) (additional source)
Diphasia attenuata (Hincks, 1866) (additional source)
Eudendrium Ehrenberg, 1834 (additional source)
Eudendrium album Nutting, 1898 (additional source)
Eudendrium capillare Alder, 1856 (additional source)
Eudendrium rameum (Pallas, 1766) (additional source)
Eudendrium ramosum (Linnaeus, 1758) (additional source)
Eutima indicans (Romanes, 1876) accepted as Eutonina indicans (Romanes, 1876) (basis of record)
Gonionemus murbachi Mayer, 1901 accepted as Gonionemus murbachii Mayer, 1901 accepted as Gonionemus vertens A. Agassiz, 1862 (basis of record)
Grammaria Stimpson, 1853 (additional source)
Grammaria serpens (Hassall, 1848) accepted as Filellum serpens (Hassall, 1848) (basis of record)
Halecium articulosum Clark, 1875 (additional source)
Halecium beanei (Johnston, 1838) accepted as Halecium beanii (Johnston, 1838) (additional source)
Halecium schneideri Bonnevie, 1898 accepted as Halecium pusillum (Sars, 1857) (basis of record)
Halecium tenellum Hincks, 1861 (additional source)
Laomedea bicuspidata (Clark, 1875) accepted as Obelia bidentata Clark, 1875 (basis of record)
Laomedea fragilis (Hincks, 1863) accepted as Laomedea neglecta Alder, 1856 (basis of record)
Laomedea gigantea (Hincks, 1866) accepted as Clytia hemisphaerica (Linnaeus, 1767) (basis of record)
Laomedea hyalina (Hincks, 1866) accepted as Gonothyraea loveni (Allman, 1859) (basis of record)
Microhydra Potts, 1885 accepted as Craspedacusta Lankester, 1880 (basis of record)
Microhydra ryderi Potts, 1885 accepted as Craspedacusta sowerbii Lankester, 1880 (basis of record)
Nemertesia Lamouroux, 1812 (additional source)
Opercularella Hincks, 1868 (additional source)
Perigonimus M. Sars, 1846 accepted as Bougainvillia Lesson, 1830 (basis of record)
Perigonimus repens (Wright, 1858) accepted as Leuckartiara octona (Fleming, 1823) (additional source)
Perigonimus serpens Allman, 1863 accepted as Amphinema dinema (Péron & Lesueur, 1810) (basis of record)
Tealia Gosse, 1858 (additional source)
Tealia felina (Linnaeus, 1767) accepted as Urticina felina (Linnaeus, 1761) (additional source)
Tubiclava lucerna Allman, 1863 (additional source)
Tubularia larynx Ellis & Solander, 1786 accepted as Ectopleura larynx (Ellis & Solander, 1786) (additional source)
Zanclea Gegenbaur, 1857 (additional source)
Zanclea gemmosa McCrady, 1859 (basis of record)

Baltic sea for Cordylophora caspia (Pallas, 1771) 
Belgian Coast for Cordylophora caspia (Pallas, 1771)  (origin: alien)
Belgian Exclusive Economic Zone for Abietinaria abietina (Linnaeus, 1758) 
Belgian Exclusive Economic Zone for Actinia equina (Linnaeus, 1758) 
Belgian Exclusive Economic Zone for Actinothoe laceratus (Dalyell, 1848) 
Belgian Exclusive Economic Zone for Aequorea vitrina Gosse, 1853 
Belgian Exclusive Economic Zone for Aglaophenia pluma (Linnaeus, 1758) 
Belgian Exclusive Economic Zone for Alcyonium digitatum Linnaeus, 1758 
Belgian Exclusive Economic Zone for Amphinema dinema (Péron & Lesueur, 1810) 
Belgian Exclusive Economic Zone for Amphisbetia operculata (Linnaeus, 1758) 
Belgian Exclusive Economic Zone for Aurelia aurita (Linnaeus, 1758) 
Belgian Exclusive Economic Zone for Beroe cucumis Fabricius, 1780 
Belgian Exclusive Economic Zone for Bimeria nutans (Wright, 1859) 
Belgian Exclusive Economic Zone for Bimeria vestita Wright, 1859 
Belgian Exclusive Economic Zone for Bougainvillia ramosa (Van Beneden, 1844) 
Belgian Exclusive Economic Zone for Bunodactis verrucosa (Pennant, 1777) 
Belgian Exclusive Economic Zone for Calliactis parasitica (Couch, 1842) 
Belgian Exclusive Economic Zone for Calycella syringa (Linnaeus, 1767) 
Belgian Exclusive Economic Zone for Campanularia hincksii Alder, 1856 
Belgian Exclusive Economic Zone for Campanularia integra MacGillivray, 1842 
Belgian Exclusive Economic Zone for Campanularia johnstoni Alder, 1856 
Belgian Exclusive Economic Zone for Campanularia verticillata (Linnaeus, 1758) 
Belgian Exclusive Economic Zone for Campanulina acuminata (Alder, 1857) 
Belgian Exclusive Economic Zone for Campanulina hincksii Hartlaub, 1897 
Belgian Exclusive Economic Zone for Campanulina repens Allman, 1864 
Belgian Exclusive Economic Zone for Cereus pedunculatus (Pennant, 1777) 
Belgian Exclusive Economic Zone for Cerianthus lloydii Gosse, 1859 
Belgian Exclusive Economic Zone for Chrysaora hysoscella (Linnaeus, 1767) 
Belgian Exclusive Economic Zone for Cladonema radiatum Dujardin, 1843 
Belgian Exclusive Economic Zone for Cordylophora Allman, 1844 
Belgian Exclusive Economic Zone for Cordylophora caspia (Pallas, 1771) 
Belgian Exclusive Economic Zone for Coryne sarsi (Lovén, 1836) 
Belgian Exclusive Economic Zone for Cosmetira polydiademata (Romanes, 1876) 
Belgian Exclusive Economic Zone for Cyanea capillata (Linnaeus, 1758) 
Belgian Exclusive Economic Zone for Dicoryne conferta (Alder, 1856) 
Belgian Exclusive Economic Zone for Diphasia attenuata (Hincks, 1866) 
Belgian Exclusive Economic Zone for Diphasia rosacea (Linnaeus, 1758) 
Belgian Exclusive Economic Zone for Dynamena pumila (Linnaeus, 1758) 
Belgian Exclusive Economic Zone for Ectopleura dumortierii (Van Beneden, 1844) 
Belgian Exclusive Economic Zone for Eirene viridula (Péron & Lesueur, 1810) 
Belgian Exclusive Economic Zone for Eucheilota maculata Hartlaub, 1894 
Belgian Exclusive Economic Zone for Eudendrium album Nutting, 1898 
Belgian Exclusive Economic Zone for Eudendrium capillare Alder, 1856 
Belgian Exclusive Economic Zone for Eudendrium rameum (Pallas, 1766) 
Belgian Exclusive Economic Zone for Eudendrium ramosum (Linnaeus, 1758) 
Belgian Exclusive Economic Zone for Eutima indicans (Romanes, 1876) 
Belgian Exclusive Economic Zone for Gossea corynetes (Gosse, 1853) 
Belgian Exclusive Economic Zone for Grammaria serpens (Hassall, 1848) 
Belgian Exclusive Economic Zone for Halecium articulosum Clark, 1875 
Belgian Exclusive Economic Zone for Halecium beanei (Johnston, 1838) 
Belgian Exclusive Economic Zone for Halecium halecium (Linnaeus, 1758) 
Belgian Exclusive Economic Zone for Halecium schneideri Bonnevie, 1898 
Belgian Exclusive Economic Zone for Halecium tenellum Hincks, 1861 
Belgian Exclusive Economic Zone for Halecium undulatum Billard, 1921 
Belgian Exclusive Economic Zone for Hybocodon prolifer Agassiz, 1860 
Belgian Exclusive Economic Zone for Hydractinia echinata (Fleming, 1828) 
Belgian Exclusive Economic Zone for Hydrallmania falcata (Linnaeus, 1758) 
Belgian Exclusive Economic Zone for Kirchenpaueria pinnata (Linnaeus, 1758) 
Belgian Exclusive Economic Zone for Laodicea undulata (Forbes & Goodsir, 1853) 
Belgian Exclusive Economic Zone for Laomedea bicuspidata (Clark, 1875) 
Belgian Exclusive Economic Zone for Laomedea dichotoma (Linnaeus, 1758) 
Belgian Exclusive Economic Zone for Laomedea exigua M. Sars, 1857 
Belgian Exclusive Economic Zone for Laomedea gelatinosa (Pallas, 1766) 
Belgian Exclusive Economic Zone for Laomedea geniculata (Linnaeus, 1758) 
Belgian Exclusive Economic Zone for Laomedea gigantea (Hincks, 1866) 
Belgian Exclusive Economic Zone for Laomedea gracilis M. Sars, 1851 
Belgian Exclusive Economic Zone for Laomedea hyalina (Hincks, 1866) 
Belgian Exclusive Economic Zone for Laomedea longissima (Pallas, 1766) 
Belgian Exclusive Economic Zone for Laomedea loveni Allman, 1859 
Belgian Exclusive Economic Zone for Leuckartiara octona (Fleming, 1823) 
Belgian Exclusive Economic Zone for Lizzella hyalina (Van Beneden, 1866) 
Belgian Exclusive Economic Zone for Margelopsis haeckelii Hartlaub, 1897 
Belgian Exclusive Economic Zone for Metridium senile (Linnaeus, 1761) 
Belgian Exclusive Economic Zone for Nemertesia antennina (Linnaeus, 1758) 
Belgian Exclusive Economic Zone for Nemertesia ramosa (Lamarck, 1816) 
Belgian Exclusive Economic Zone for Obelia Péron & Lesueur, 1810 
Belgian Exclusive Economic Zone for Opercularella lacerata (Johnston, 1847) 
Belgian Exclusive Economic Zone for Pelagia perla (Slabber, 1781) 
Belgian Exclusive Economic Zone for Perigonimus repens (Wright, 1858) 
Belgian Exclusive Economic Zone for Perigonimus serpens Allman, 1863 
Belgian Exclusive Economic Zone for Phialella quadrata (Forbes, 1848) 
Belgian Exclusive Economic Zone for Phialidium hemisphaericum (Linnaeus, 1767) 
Belgian Exclusive Economic Zone for Pleurobrachia pileus (O. F. Müller, 1776) 
Belgian Exclusive Economic Zone for Plumularia setacea (Linnaeus, 1758) 
Belgian Exclusive Economic Zone for Podocoryna areolata (Alder, 1862) 
Belgian Exclusive Economic Zone for Podocoryna carnea M. Sars, 1846 
Belgian Exclusive Economic Zone for Rathkea octopunctata (M. Sars, 1835) 
Belgian Exclusive Economic Zone for Rhizostoma octopus (Gmelin, 1791) 
Belgian Exclusive Economic Zone for Sagartia troglodytes (Price in Johnston, 1847) 
Belgian Exclusive Economic Zone for Sarsia gemmifera Forbes, 1848 
Belgian Exclusive Economic Zone for Sarsia tubulosa (M. Sars, 1835) 
Belgian Exclusive Economic Zone for Sertularella gayi (Lamouroux, 1821) 
Belgian Exclusive Economic Zone for Sertularella polyzonias (Linnaeus, 1758) 
Belgian Exclusive Economic Zone for Sertularella rugosa (Linnaeus, 1758) 
Belgian Exclusive Economic Zone for Sertularia cupressina Linnaeus, 1758 
Belgian Exclusive Economic Zone for Synarachnactis bournei (Fowler, 1897) 
Belgian Exclusive Economic Zone for Tealia felina (Linnaeus, 1767) 
Belgian Exclusive Economic Zone for Thuiaria thuja (Linnaeus, 1758) 
Belgian Exclusive Economic Zone for Trichydra pudica Wright, 1857 
Belgian Exclusive Economic Zone for Tubiclava lucerna Allman, 1863  (doubtful)

Dutch dekseldragende tandhorenkoraal for Amphisbetia operculata (Linnaeus, 1758)
Dutch fijne zeeden for Abietinaria abietina (Linnaeus, 1758)
Dutch flessenborstel for Thuiaria thuja (Linnaeus, 1758)
Dutch gaafgerande klokpolyp [from synonym] for Campanularia integra MacGillivray, 1842
Dutch gedraaide zeedraad [from synonym] for Laomedea gelatinosa (Pallas, 1766)
Dutch geknoopte zeedraad [from synonym] for Laomedea geniculata (Linnaeus, 1758)
Dutch gekromde zeeborstel for Hydrallmania falcata (Linnaeus, 1758)
Dutch gemeene knodspolyp for Clava multicornis (Forsskål, 1775)
Dutch gemeene zeeanemoon for Actinia equina (Linnaeus, 1758)
Dutch geoorde zeekwal for Aurelia aurita (Linnaeus, 1758)
Dutch geschulpte zeeanemoon for Metridium senile (Linnaeus, 1761)
Dutch gespletene zeedraad [from synonym] for Laomedea dichotoma (Linnaeus, 1758)
Dutch getakte zeespriet for Nemertesia ramosa (Lamarck, 1816)
Dutch granaatroode tandhorenkoraal for Diphasia rosacea (Linnaeus, 1758)
Dutch rimpelige tandhorenkoraal for Sertularella rugosa (Linnaeus, 1758)
Dutch stijne zeeborstel for Plumularia setacea (Linnaeus, 1758)
Dutch vederachtige zeeborstel for Kirchenpaueria pinnata (Linnaeus, 1758)
Dutch zeedraad [from synonym] for Laomedea longissima (Pallas, 1766)
Dutch zeekwal for Cyanea capillata (Linnaeus, 1758)
French actinie plumeuse for Metridium senile (Linnaeus, 1761)
French oeillet de mer for Metridium senile (Linnaeus, 1761)
French poumons de mer for Rhizostoma octopus (Gmelin, 1791)

 Authority

 for Calliactis parasitica (Couch, 1842)

Couch, 1844 [details]

 Authority

 for Halecium articulosum Clark, 1875

Clarke, 1876 [details]

 Authority

 for Halecium tenellum Hincks, 1861

(Hincks, 1868) [details]

 Biology

 for Beroe cucumis Fabricius, 1780

Phosphorescent [details]

 Biology

 for Dynamena pumila (Linnaeus, 1758)

Fluorescent. [details]

 Distribution

 for Aurelia aurita (Linnaeus, 1758)

Cosmopolitan species. [details]

 Distribution

 for Calliactis parasitica (Couch, 1842)

Mediterranean species, reaches its most northern limit somewhere around Belgium. [details]

 Distribution

 for Chrysaora hysoscella (Linnaeus, 1767)

Cosmopolitan species. [details]

 Distribution

 for Cyanea capillata (Linnaeus, 1758)

Cosmopolitan species. [details]

 Distribution

 for Halecium tenellum Hincks, 1861

Cosmopolitan. [details]

 Distribution

 for Laomedea flexuosa Alder, 1857

Boreal and littoral species. [details]

 Distribution

 for Laomedea gelatinosa (Pallas, 1766)

enters deeply into estuaries. [details]

 Distribution

 for Laomedea longissima (Pallas, 1766)

Cosmopolitan species. [details]

 Distribution

 for Plumularia setacea (Linnaeus, 1758)

Cosmopolitan species. [details]

 Introduced species vector dispersal

 for Cordylophora caspia (Pallas, 1771)

in Belgian part of the North Sea: Ships: accidental with ballast water, sea water systems, live wells or other deck ... [details]

 Publication date

 for Amphinema dinema (Péron & Lesueur, 1810)

1809 [details]