Cnidaria (Jellyfish, Corals, Sea Anemones etc.)
Class: Anthozoa
Subclass: Hexacorallia
Order: Actiniaria
Family: Edwardsiidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Edwardsia ivelli | Manuel, 1975 | Ivell's sea anenome | 1983 | Widewater Lagoon, West Sussex, England | Missing | Access |
Order: Scleractinia
Family: Dendrophylliidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Rhizopsammia wellingtoni | Wells, 1982 | Wellington's solitary coral | 2000 | Galápagos Archipelago | Missing | Access |
Family: Montastraeidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Orbicella nancyi | (Pandolfi, 2007) | Organ-pipe orbicella | 82ka | Caribbean (San Andrés; Barbados; Lesser and the Greater Antilles; Curaςao) | Extinct | Access |
Family: Mussidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Scolymia cubensis | Milne Edwards & Haime, 1849 | Artichoke coral | - | Jamaica | Rediscovered | Access |
Family: Oculinidae
–No subordinate taxa
Family: Pocilloporidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Pocillopora palmata | Palmer, 1928 | - | Late Pleistocene | Caribbean | Extinct | Access |
Family: Rhizangiidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Siderastrea glynni | Budd & Guzman, 1994 | 1992 | Panama | Invalid (synonym) | Access |
Order: Zoantharia
Family: Neozoanthidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Neozoanthus tulearensis | Herberts, 1972 | (rediscovered) | Madagascar, Ryukyu Islands, Japan & Queensland, Australia | Rediscovered | Access |
Subclass: Octocorallia
Order: Alcyonacea
Family: Nidaliidae
| Scientific Name | Author/s | Common name | Last Record | Distribution | Status | Taxon Profile |
| Nidalia studeri | G. von Koch, 1891 | - | - | Mediterranean | Rediscovered | Access |
Class: Cubozoa
Order: Carybdeida
Family: Alatinidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Alatina grandis | Agassiz & Mayer, 1902 | - | (rediscovered) | French Polynesia to Arabian Sea | Rediscovered | Access |
Class: Hydrozoa
Subclass: Hydroidolina
Order: Anthoathecata
Family: Acaulidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Acauloides ilonae | (Brinckmann-Voss, 1966) | ? | Mediterranean | Missing | Access |
Family: Cladonematidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Staurocladia portmanni | Brinckmann, 1964 | ? | Mediterranean | Missing | Access |
Family: Corymorphidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Branchiocerianthus italicus | Stechow, 1921 | ? | Mediterranean | Missing | Access | |
| Siphonohydra adriatica | Salvini-Plawen, 1966 | ? | Mediterranean | Missing | Access |
Family: Corynidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Coryne caespes | Allman, 1871 | ? | Mediterranean | Missing or invalid | Access | |
| Coryne fucicola | (de Filipi, 1866) | ? | Mediterranean | Rediscovered | Access |
Family: Milleporidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Millepora boschmai | De Weerdt & Glynn, 1991 | Boschmai's fire coral | 1997/1998 | Gulf of Chiriquí, Panama | Missing | Access |
Family: Pandeidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Codonorchis octaedrus | Haeckel, 1879 | (rediscovered) | Europe | Rediscovered | Access | |
| Merga galleri | Brinckmann, 1962 | ? | Mediterranean | Missing | Access |
Family: Ptilocodiidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Tregoubovia atentaculata | Picard, 1958 | ? | Mediterranean | Missing | Access |
Family: Rathkeidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Lizzia octostyla | (Haeckel, 1879) | ? | Mediterranean | Missing | Access |
Family: Rosalindidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Rosalinda incrustans | Kramp, 1947 | - | - | Mediterranean | Rediscovered | Access |
Family: Tubulariidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Hybocodon chilensis | Hartlaub, 1905 | - | - | Chile | Rediscovered | Access |
Order: Leptothecata
Family: Aglaopheniidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Gymnangium sibogae | (Billard, 1913) | - | - | Indonesia (including the Moluccas) | Rediscovered | Access |
Family: Laodiceidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Melicertissa adriatica | Neppi, 1915 | ? | Mediterranean | Missing | Access |
Family: Lovenellidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Eucheilota maasi | Neppi & Stiasny, 1911 | ? | Mediterranean | Missing | Access | |
| Hydranthea aloysii | (Zoja, 1893) | ? | Mediterranean | Invalid? | Access |
Family: Melicertidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Orchistomella graeffei | (Neppi & Stiasny, 1911) | ? | Mediterranean | Invalid? | Access |
Family: Plumulariidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Callicarpa chazaliei | Versluys, 1899 | - | - | Brazil, Florida & Venezuela | Rediscovered | Access |
| Plumularia syriaca | Billard, 1931 | Mediterranean | Missing | Access |
Family: Tiaropsidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Octogonade mediterranea | Zoja, 1896 | ? | Mediterranean | Missing | Access | |
| Tiaropsidium mediterraneum | (Metschnikoff, 1886) | ? | Mediterranean | Missing | Access |
Subclass: Trachylinae
Order: Limnomedusae
Family: Olindiidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Astrohydra japonica | Hashimoto, 1981 | - | (rediscovered) | Shizuoka Prefecture, Japan | Rediscovered | Access |
| Craspedacusta iseanum | (Oka & Hara, 1922) | - | c.1922 | Japan | Missing | Access |
Order: Narcomedusae
Family: Cuninidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Cunina polygonia | (Haeckel, 1879) | ? | Mediterranean | Invalid? | Access | |
| Cunina proboscidea | Metschnikoff & Metschnikoff, 1871 | ? | Mediterranean | Missing | Access |
Class: Myxozoa
Subclass: Myxosporea
Order: Bivalvulida
Family: Sphaerosporidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Sphaerospora ranae | Morelle, 1929 | - | - | ? | Rediscovered | Access |
Class: Scyphozoa
Subclass: Discomedusae
Order: Rhizostomeae
Family: Catostylidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Crambione cookii | Mayer, 1910 | - | - | Queensland, Australia | Rediscovered | Access |
Appendix 1: Rediscovery turned out to be a new species
Galaxea paucisepta:
Claereboudt, M. (1990). Galaxea paucisepta nom. nov. (for G. pauciradiata), rediscovery and redescription of a poorly known scleractinian species (Oculinidae). Galaxea 9: 1-8.
Hoeksema, B. W. (1993). Some misapplied nomina nova in reef coral taxonomy (Scleractinia). Zoologische Mededelingen 67(3): 41-47.