• Abietinaria laevimarginata (Ritchie, 1907)
• Abyla trigona Quoy & Gaimard, 1827
• Abylopsis eschscholtzii (Huxley, 1859)
• Acromitus flagellatus (Maas, 1903)
• Aegina citrea Eschscholtz, 1829
• Aeginura grimaldii Maas, 1904
• Aequorea aequorea (Forsskål, 1775) accepted as Aequorea forskalea Péron & Lesueur, 1810
• Aequorea coerulescens (Brandt, 1835)
• Aequorea conica Browne, 1905
• Aequorea forskalea Péron & Lesueur, 1810
• Aequorea globosa Eschscholtz, 1829
• Aequorea macrodactyla (Brandt, 1835)
• Aequorea parva Browne, 1905
• Aequorea pensilis (Haeckel, 1879)
• Agalma okenii Eschscholtz, 1825
• Aglantha elata (Haeckel, 1879)
• Aglaophenia cupressina Lamouroux, 1816 accepted as Pachyrhynchia cuppressina (Lamouroux, 1816)
• Aglaophenia latecarinata Allman, 1877
• Aglaophenia pluma (Linnaeus, 1758)
• Aglaura hemistoma Péron & Lesueur, 1810
• Aglauropsis agassizi Müller, 1865 (uncertain > taxon inquirendum)
• Aglauropsis kawari Moreira & Yamashita, 1972
• Aglophenia latecarinata (Allman, 1877) accepted as Aglaophenia latecarinata Allman, 1877
• Alatina alata (Reynaud, 1830)
• Allopora oculina Ehrenberg, 1834 accepted as Stylaster norvegicus (Gunnerus, 1768)
• Amphinema dinema (Péron & Lesueur, 1810)
• Amphinema rugosum (Mayer, 1900)
• Amphisbetia bidens (Bale, 1884)
• Amphogona apicata Kramp, 1957
• Amphogona apsteini (Vanhöffen, 1902)
• Antennella secundaria (Gmelin, 1791)
• Anthohebella parasitica (Ciamician, 1880)
• Aurelia aurita (Linnaeus, 1758)
• Aurelia maldivensis Bigelow, 1904
• Bicorona elegans Millard, 1966
• Billardia intermedia Blanco, 1967
• Botrynema brucei Browne, 1908
• Bougainvillia fulva Agassiz & Mayer, 1899, sensu Kramp, 1968
• Bougainvillia meinertiae Jäderholm, 1923
• Bougainvillia muscus (Allman, 1863)
• Bougainvillia niobe Mayer, 1894
• Bougainvillia platygaster (Haeckel, 1879)
• Bougainvillia ramosa (Van Beneden, 1844) accepted as Bougainvillia muscus (Allman, 1863)
• Bythotiara capensis Pagès, Bouillon & Gili, 1991
• Calamphora campanulata (Warren, 1908)
• Calycopsis papillata Bigelow, 1918
• Calycopsis simulans (Bigelow, 1909)
• Campanularia africana Stechow, 1923
• Campanularia agas Cornelius, 1982
• Campanularia clytioides (Lamouroux, 1824) (uncertain > taxon inquirendum)
• Campanularia crenata (Hartlaub, 1901) accepted as Orthopyxis crenata (Hartlaub, 1901)
• Campanularia gravieri Billard, 1904 accepted as Clytia linearis (Thorneley, 1900)
• Campanularia hemisphaerica (Linnaeus, 1767) accepted as Clytia hemisphaerica (Linnaeus, 1767)
• Campanularia paulensis Vanhöffen, 1910 accepted as Clytia paulensis (Vanhöffen, 1910)
• Campanularia pecten Gow & Millard, 1975
• Campanularia roberti Gow & Millard, 1975
• Candelabrum capensis (Manton, 1940)
• Carybdea branchi Gershwin & Gibbons, 2009 accepted as Carybdea murrayana Haeckel, 1880
• Carybdea murrayana Haeckel, 1880
• Cassiopea andromeda (Forskål, 1775)
• Cassiopea depressa Haeckel, 1880
• Catostylus mosaicus (Quoy & Gaimard, 1824)
• Catostylus perezi Ranson, 1945
• Catostylus viridiscens (Chun) (unaccepted > nomen nudum)
• Cephea cephea (Forskål, 1775)
• Cephea octostyla (Forskål, 1775)
• Ceratella labyrinthica Hyatt, 1877 accepted as Solanderia labyrinthica (Hyatt, 1877)
• Chiropsalmus quadrumanus (F. Muller, 1859)
• Chiropsalmus zygonema Haeckel, 1880 (uncertain > nomen dubium)
• Chrysaora fulgida (Reynaud, 1830)
• Chrysaora lactea Eschscholtz, 1829
• Chrysaora quinquecirrha (Desor, 1848)
• Cirrhitiara superba (Mayer, 1900)
• Cirrholovenia tetranema Kramp, 1959
• Cladocarpus pegmatis Millard, 1980
• Cladocarpus stechowi Ramil & Vervoort, 1992
• Clytia brevithecata (Thornely, 1900)
• Clytia gracilis (M. Sars, 1851)
• Clytia hemisphaerica (Linnaeus, 1767)
• Clytia hummelincki (Leloup, 1935) accepted as Clytia brevithecata (Thornely, 1900)
• Clytia johnstoni (Alder, 1856) accepted as Clytia hemisphaerica (Linnaeus, 1767)
• Clytia latitheca Millard & Bouillon, 1973 accepted as Clytia thornelyi (Nutting, 1927)
• Clytia linearis (Thorneley, 1900)
• Clytia maccradyi (Brooks, 1888) accepted as Clytia mccradyi (Brooks, 1888)
• Clytia mccradyi (Brooks, 1888)
• Clytia paulensis (Vanhöffen, 1910)
• Clytia simplex (Browne, 1902)
• Clytia thornelyi (Nutting, 1927)
• Clytia warreni Stechow, 1919
• Cnidoscyphus aequalis (Warren, 1908) accepted as Thyroscyphus aequalis Warren, 1908
• Colobonema sericeum Vanhöffen, 1902
• Conopora laevis (Studer, 1878)
• Conopora major Hickson & England, 1905 accepted as Conopora verrucosa (Studer, 1878)
• Conopora tenuis Moseley, 1879 accepted as Conopora laevis (Studer, 1878)
• Conopora verrucosa (Studer, 1878)
• Corhiza bellicosa Millard, 1962
• Corhiza complexa (Nutting, 1906)
• Corhiza pannosa Millard, 1962
• Corhiza scotiae (Ritchie, 1907)
• Corhiza sociabilis Millard, 1980