Actinulida (basis of record)
Aeginidae Gegenbaur, 1857 (basis of record)
Aglantha Haeckel, 1879 (additional source)
Aglaopheniidae Marktanner-Turneretscher, 1890 (basis of record)
Amphisbetia L. Agassiz, 1862 (additional source)
Amphisbetia operculata (Linnaeus, 1758) (additional source)
Anthoathecata (basis of record)
Armorhydridae Swedmark & Teissier, 1958 (basis of record)
Barcinidae Gili, Bouillon, Pagès, Palanques & Puig, 1999 (basis of record)
Blackfordiidae Bouillon, 1984 (basis of record)
Bougainvillia Lesson, 1830 (additional source)
Bougainvillia alderi (Hodge, 1863) accepted as Bougainvillia muscus (Allman, 1863) (basis of record)
Bougainvillia britannica (Forbes, 1841) (additional source)
Bougainvillia flavida Hartlaub, 1897 accepted as Bougainvillia britannica (Forbes, 1841) (additional source)
Bougainvillia muscus (Allman, 1863) (additional source)
Bougainvillia nigritella Forbes, 1848 accepted as Bougainvillia muscoides (Sars, 1846) (basis of record)
Bougainvillia principis (Steenstrup, 1850) (additional source)
Bougainvillia pyramidata (Forbes & Goodsir, 1853) (additional source)
Bougainvilliidae Lütken, 1850 (basis of record)
Campanulariidae Johnston, 1836 (basis of record)
Capitata (basis of record)
Cladocorynidae Allman, 1872 (basis of record)
Cladonema Dujardin, 1843 (additional source)
Cladonema radiatum Dujardin, 1843 (additional source)
Clavidae McCrady, 1859 accepted as Hydractiniidae L. Agassiz, 1862 (basis of record)
Clytia Lamouroux, 1812 (additional source)
Clytia gracilis (M. Sars, 1851) (additional source)
Clytia hemisphaerica (Linnaeus, 1767) (additional source)
Clytia paulensis (Vanhöffen, 1910) (additional source)
Conica accepted as Leptothecata (basis of record)
Corymorpha M. Sars, 1835 (additional source)
Corymorpha nutans M. Sars, 1835 (additional source)
Corymorphidae Allman, 1872 (basis of record)
Corynidae Johnston, 1836 (basis of record)
Cosmetira Forbes, 1848 (additional source)
Craspedacusta Lankester, 1880 (additional source)
Craspedacusta sowerbii Lankester, 1880 (additional source)
Dipleurosomatidae Boeck, 1868 (basis of record)
Dipurena McCrady, 1859 accepted as Slabberia Forbes, 1846 (additional source)
Ectopleura L. Agassiz, 1862 (additional source)
Ectopleura dumortierii (Van Beneden, 1844) (additional source)
Eirene Eschscholtz, 1829 (additional source)
Eirenidae Haeckel, 1879 (basis of record)
Eleutheriidae Russell, 1953 accepted as Cladonematidae Gegenbaur, 1857 (basis of record)
Eucheilota McCrady, 1859 (additional source)
Euphysidae Haeckel, 1879 accepted as Corymorphidae Allman, 1872 (basis of record)
Eutima McCrady, 1859 (additional source)
Eutima gracilis (Forbes & Goodsir, 1853) (additional source)
Filifera (basis of record)
Geryoniidae Eschscholtz, 1829 (basis of record)
Gonionemus vertens A. Agassiz, 1862 (additional source)
Gossea L. Agassiz, 1862 accepted as Octobulbacea Zamponi, 1983 (additional source)
Gossea corynetes (Gosse, 1853) accepted as Octobulbacea corynetes (Gosse, 1853) (additional source)
Gymnangium Hincks, 1874 (additional source)
Haleciidae Hincks, 1868 (basis of record)
Hybocodon L. Agassiz, 1860 (additional source)
Hydractinia Van Beneden, 1844 (additional source)
Hydractinia carnea (M. Sars, 1846) accepted as Podocoryna carnea M. Sars, 1846 (additional source)
Hydractiniidae L. Agassiz, 1862 (basis of record)
Hydranthea Hincks, 1868 (additional source)
Hydranthea margarica (Hincks, 1862) (additional source)
Hydroidolina (basis of record)
Lafoeidae Hincks, 1868 (basis of record)
Laingiidae Bouillon, 1978 accepted as Magapiidae Schuchert & Bouillon, 2009 (basis of record)
Laingiomedusae accepted as Anthoathecata (basis of record)
Laodicea Lesson, 1843 (additional source)
Laodicea undulata (Forbes & Goodsir, 1853) (additional source)
Laodiceidae Agassiz, 1862 (basis of record)
Leptothecata (basis of record)
Leuckartiara Hartlaub, 1914 (additional source)
Leuckartiara octona (Fleming, 1823) (additional source)
Limnomedusae (basis of record)
Lovenella Hincks, 1868 (additional source)
Lovenella clausa (Lovén, 1836) (additional source)
Margelina Haeckel, 1879 (basis of record)
Margelis nordgaardi Browne, 1903 accepted as Bougainvillia muscoides (Sars, 1846) (basis of record)
Margelopsidae Mayer, 1910 (basis of record)
Margelopsis Hartlaub, 1897 (additional source)
Melicertidae Agassiz, 1862 (basis of record)
Mitrocomella polydiademata (Romanes, 1876) (additional source)
Mitrocomidae Haeckel, 1879 (basis of record)
Modeeria Forbes, 1848 (additional source)
Moerisiida Poche, 1914 (basis of record)
Moerisiidae Poche, 1914 (basis of record)
Monotheca Nutting, 1900 (additional source)
Monotheca obliqua (Johnston, 1847) (additional source)
Narcomedusae (basis of record)
Niobiidae Petersen, 1979 (basis of record)
Obelia Péron & Lesueur, 1810 (additional source)
Obelia dichotoma (Linnaeus, 1758) (additional source)
Obelia geniculata (Linnaeus, 1758) (additional source)
Obelia longissima (Pallas, 1766) (additional source)
Oceania Péron & Lesueur, 1810 (additional source)
Olindiasidae Haeckel, 1879 accepted as Olindiidae Haeckel, 1879 (basis of record)
Orchistomatidae Bouillon, 1984 (basis of record)
Orthopyxis L. Agassiz, 1862 (additional source)
Orthopyxis integra (MacGillivray, 1842) (additional source)
Otohydridae Swedmark & Teissier, 1958 (basis of record)
Pandeida (basis of record)
Pandeiidae Haeckel, 1879 accepted as Pandeidae Haeckel, 1879 (basis of record)

Europe for Olindiasidae Haeckel, 1879 
Europe for Pandeiidae Haeckel, 1879 

 additional information

 for Nemertesia antennina (Linnaeus, 1758)

Allman (1871) reported reduced medusoids in Nemertesia antennina (L. 1758), but this observation has not been ... [details]

 Authority

 for Monotheca obliqua (Johnston, 1847)

(Saunders in Johnston, 1847) [details]

 Authority

 for Sertularia marginata (Kirchenpauer, 1864)

Kirchenpauer, 1864 [details]

 Ecology

 for Hydrichthys cyclothonis Damas, 1934

complete cycle unknown? [details]

 Synonymy

 for Bougainvillia flavida Hartlaub, 1897

Synonymised with Bougainvillia britannica (Forbes, 1841) [details]