Agliscra invertens (Allman, 1874) accepted as Aglantha digitale (O. F. Müller, 1776) (new combination reference)
Archirhiza aurosa Haeckel, 1879 (original description)
Archirhiza primordialis Haeckel, 1879 (original description)
Atolla Haeckel, 1880 (original description)
Atolla wyvillei Haeckel, 1880 (original description)
Aurelia (Aurelissa) Haeckel, 1879 (original description)
Aurelia (Aurelissa) clausa Lesson, 1830 represented as Aurelia clausa Lesson, 1830 (additional source)
Aurelia (Aurelissa) labiata Chamisso & Eysenhardt, 1821 represented as Aurelia labiata Chamisso & Eysenhardt, 1821 (additional source)
Aurelia (Aurelissa) limbata Brandt, 1835 represented as Aurelia limbata Brandt, 1835 (additional source)
Aurelia aurita (Linnaeus, 1758) (additional source)
Aurelia colpota Brandt, 1835 (additional source)
Aurelia cruciata Haeckel, 1880 (additional source)
Aurelia cruciata Haeckel, 1880 (original description)
Aurelia hyalina Brandt, 1835 (additional source)
Aurelia marginalis Agassiz, 1862 (additional source)
Aurellia flavidula Peron & Lesueur accepted as Aurelia aurita (Linnaeus, 1758) (additional source)
Auricoma Haeckel, 1879 (original description)
Auricoma aphrodite Haeckel, 1879 (original description)
Aurosa Haeckel, 1880 (original description)
Aurosa furcata Haeckel, 1880 (original description)
Brachiolophus collaris Haeckel, 1879 (original description)
Cannorhiza connexa Haeckel, 1879 (original description)
Carybdea alata Reynaud, 1830 accepted as Alatina alata (Reynaud, 1830) (additional source)
Carybdea marsupialis (Linnaeus, 1758) (additional source)
Carybdea murrayana Haeckel, 1880 (original description)
Carybdea obeliscus Haeckel, 1879 accepted as Alatina obeliscus (Haeckel, 1880) (original description)
Carybdea philippina Haeckel, 1880 accepted as Alatina philippina (Haeckel, 1880) (additional source)
Carybdea pyramis Haeckel, 1880 represented as Alatina pyramis (Haeckel, 1880) (original description)
Cassiopea andromeda (Forskål, 1775) (additional source)
Cassiopea depressa Haeckel, 1880 (original description)
Cassiopea mertensi (Brandt, 1838) (additional source)
Cassiopea ornata Haeckel, 1880 (original description)
Catostylus cruciatus (Lesson, 1830) (new combination reference)
Catostylus mosaicus (Quoy & Gaimard, 1824) (new combination reference)
Cephea conifera Haeckel, 1880 (original description)
Cephea diplopilus Haeckel (additional source)
Cephea forskalea Haeckel, 1880 accepted as Cephea cephea (Forskål, 1775) (additional source)
Cephea forskalea Haeckel, 1880 accepted as Cephea cephea (Forskål, 1775) (original description)
Cephea fusca Pèron & Lesueur (additional source)
Chirodropus Haeckel, 1880 (original description)
Chirodropus gorilla Haeckel, 1880 (original description)
Chirodropus palmatus Haeckel, 1880 represented as Chimaerus palmatus (Haeckel, 1880) (original description)
Chiropsalmus quadrigatus Haeckel, 1880 accepted as Chiropsoides quadrigatus (Haeckel, 1880) (original description)
Chiropsalmus quadrumanus (F. Muller, 1859) (additional source)
Chiropsalmus zygonema Haeckel, 1880 (original description)
Chrysaora blossevillii Lesson, 1830 accepted as Chrysaora lactea Eschscholtz, 1829 (additional source)
Chrysaora caliparea (Reynaud, 1830) (additional source)
Chrysaora fulgida (Reynaud, 1830) (additional source)
Chrysaora helvola Brandt, 1838 accepted as Chrysaora fuscescens Brandt, 1835 (additional source)
Chrysaora isosceles Eschscholtz (additional source)
Chrysaora mediterranea Péron & Lesueur, 1810 accepted as Chrysaora hysoscella (Linnaeus, 1767) (additional source)
Chrysaora melanaster Brandt, 1835 (additional source)
Chrysaora plocamia (Lesson, 1830) (additional source)
Codonium conicum Haeckel, 1880 accepted as Sarsia conica (Haeckel, 1880) (original description)
Collaspidae Haeckel, 1880 accepted as Atollidae Hickson, 1906 (original description)
Collaspis Haeckel, 1880 accepted as Atolla Haeckel, 1880 (original description)
Collaspis achillis Haeckel, 1880 accepted as Atolla wyvillei Haeckel, 1880 (original description)
Cotylorhiza ambulacrata Haeckel, 1880 (original description)
Cotylorhiza tuberculata (Macri, 1778) (additional source)
Crambessa cruciata Haeckel (additional source)
Crambessa mosaica Haeckel (additional source)
Crambessa palmipes Haeckel, 1880 accepted as Mastigietta palmipes (Haeckel, 1880) (original description)
Crambessa pictonum Haeckel, 1880 accepted as Catostylus tagi (Haeckel, 1869) (original description)
Crambessa tagi Haeckel, 1869 accepted as Catostylus tagi (Haeckel, 1869) (additional source)
Cramborhiza Haeckel, 1880 accepted as Lychnorhiza Haeckel, 1880 (original description)
Cramborhiza flagellata Haeckel, 1880 accepted as Lychnorhiza lucerna Haeckel, 1880 (original description)
Craterolophus tethys James-Clark, 1863 accepted as Craterolophus convolvulus (Johnston, 1835) (additional source)
Crossostoma corolliflora Haeckel (additional source)
Crossostoma dubreuilli Haeckel (additional source)
Crossostoma frondifera Haeckel (additional source)
Cyanea arctica Péron & Lesueur, 1810 accepted as Cyanea capillata (Linnaeus, 1758) (additional source)
Cyanea capillata (Linnaeus, 1758) (additional source)
Cyanea ferruginea Eschscholtz, 1829 (additional source)
Cyanea lamarckii Péron & Lesueur, 1810 (additional source)
Cyanea postelsi Brandt, 1835 (additional source)
Cyanea versicolor Agassiz, 1862 (additional source)
Cytaeis exigua Haeckel, 1880 accepted as Hydractinia exigua (Haeckel, 1880) accepted as Podocoryna exigua (Haeckel, 1880) (original description)
Dactylometra lactea L. Agassiz accepted as Chrysaora lactea Eschscholtz, 1829 (additional source)
Dactylometra quinquecirrha Agassiz, 1862 accepted as Chrysaora quinquecirrha (Desor, 1848) (additional source)
Depastrella Haeckel, 1880 accepted as Depastrum Gosse, 1858 (original description)
Depastrella allmani Haeckel, 1880 accepted as Depastrum cyathiforme (M. Sars, 1846) (original description)
Depastrella allmani Haeckel, 1880 accepted as Depastrum cyathiforme (M. Sars, 1846) (additional source)
Depastrella carduella Haeckel, 1880 accepted as Depastrum cyathiforme (M. Sars, 1846) (original description)
Depastrum cyathiforme (M. Sars, 1846) (additional source)
Depastrum polare Haeckel, 1880 accepted as Depastrum cyathiforme (M. Sars, 1846) (original description)
Desmonema annasethe Haeckel, 1880 accepted as Cyanea annasethe (Haeckel, 1880) (original description)
Desmonema gaudichaudi (Lesson, 1830) (additional source)
Desmonema imporcata Haeckel (additional source)
Desmonema pendula Haeckel (additional source)
Dipleurosoma irregulare Haeckel, 1879 accepted as Dipleurosoma typicum Boeck, 1868 (additional source)
Discomedusae (original description)
Drymonema Haeckel, 1880 (original description)
Drymonema dalmatina Haeckel, 1880 accepted as Drymonema dalmatinum Haeckel, 1880 (original description)
Drymonema dalmatinum Haeckel, 1880 (original description)
Drymonematidae Haeckel, 1880 (original description)
Ephyra discometra Haeckel, 1879 (original description)
Ephyra prometor Haeckel, 1879 (original description)
Eucrambessa mülleri Haeckel, 1879 (original description)
Eupilema Haeckel, 1880 (original description)
Eupilema claustra Haeckel (additional source)

Corfu for Nausicaa phaeacum Haeckel, 1880  (origin: native)
Cuban part of the Caribbean Sea for Linerges mercurius Haeckel, 1880  (origin: native)
Fernando Po for Toxoclytus tripterus Haeckel, 1880 
French part of the Bay of Biscay for Crambessa pictonum Haeckel, 1880 
Gulf of Guinea for Undosa undulata Haeckel, 1880  (origin: native)
Gulf of Naples (Italy) for Cytaeis exigua Haeckel, 1880 
Indian Ocean for Codonium conicum Haeckel, 1880 
Kerguelen Exclusive Economic Zone for Collaspis achillis Haeckel, 1880 
Madagascar for Rhopilema rhopalophorum Haeckel, 1880 
North Australian Shelf for Crambessa palmipes Haeckel, 1880 
Pernambuco for Cramborhiza flagellata Haeckel, 1880 
Red Sea for Cephea forskalea Haeckel, 1880 
Red Sea for Stylorhiza octostyla Haeckel, 1880 
Rio de Janeiro for Lychnorhiza lucerna Haeckel, 1880 
Samoan Exclusive Economic Zone for Cephea conifera Haeckel, 1880 
Samoan Exclusive Economic Zone for Mastigias pantherina Haeckel, 1880 
Sumatra for Eupilema scapulare Haeckel, 1880 
Sunda Sea for Versura palmata Haeckel, 1880 
Surinamese Exclusive Economic Zone for Stomolophus fritillarius Haeckel, 1880 
West Africa Coast for Cotylorhiza ambulacrata Haeckel, 1880 

Holotype PMJ Coel 795, geounit North Australia, identified as Crambessa palmipes Haeckel, 1880
Syntype ZMUC unnumbered, geounit Cuban part of the Caribbean Sea, identified as Linerges mercurius Haeckel, 1880

 Taxonomic remark

 for Medusa persea Forsskål, 1775

A synonym of Aurelia aurita (Mediterranean form) according to Haeckel (1880: 553) [details]