Cnidaria (Jellyfish, Corals, Sea Anemones etc.)
Taxonomy
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 |
| Montastraea nancyi | Pandolfi, 2007 | - | c.80,000BC | Caribbean | Extinct | Access |
| Montastraea sp. nov. 'Organ-Pipe' | - | - | Late Pleistocene | Caribbean | 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
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Galaxea paucisepta | Claereboudt, 1990 | (rediscovered) | Indo-West Pacific | Rediscovered | Access |
Family: Pocilloporidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Pocillopora palmata | Palmer, 1928 | - | Late Pleistocene | Caribbean | Extinct | 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
Subclass: -
Order: Carybdeida
Family: Alatinidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Alatina grandis | Agassiz & Mayer, 1902 | - | - | Arabian Sea | Rediscovered | Access |
Class: Hydrozoa
Subclass: Hydroidolina
Order: Anthoathecata
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 |
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 |
Subclass: Trachylinae
Order: Limnomedusae
Family: Olindiidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Astrohydra japonica | Hashimoto, 1981 | - | 1985 | Shizuoka Prefecture, Japan | "Missing" | Access |
| Craspedacusta iseanum | (Oka & Hara, 1922) | - | c.1922 | Japan | "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 |