Echinodermata (Echinoderms)
Taxonomy
Class: Asteroidea
Order: Forcipulatida
Family: Heliasteridae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Heliaster solaris | Clark, 1920 | 24-rayed sunstar | 1983 | Galápagos Islands, Ecuador | Extinct | Access |
Order: Valvatida
Family: Oreasteridae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Halityle regularis | Fisher, 1913 | - | - | Africa, Australia, Madagascar & Philippines | Rediscovered | Access |
Family: Poraniidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Patiriella littoralis | Dartnall, 1970 | Derwent River seastar | 1993 | Tasmania, Australia | Extinct | Access |
Class: Echinoidea
Order: Clypeasteroida
Family: Clypeasteridae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Hesperaster crassus | H. L. Clark, 1938 | - | Mid-Holocene | Western Australia, Australia | Extinct | Access |
Order: Spatangoida
Family: Brissidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Taimanawa mortenseni | Henderson & Fell, 1969 | - | - | Indo-Pacific Ocean? | Rediscovered | Access |
Family: Loveniidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Breynia vredenburgi | Anderson, 1907 | - | - | Andaman Islands, India | Rediscovered | Access |
Class: Holothuroidea
Order: Elasipodida
Family: Elpidiidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
Peniagone leander | Pawson & Foell, 1986 | - | Pacific Ocean (incl. Mariana Trench area) | Rediscovered | Access | |
| Penilpidia ludwigi | von Marenzeller, 1893 | Ludwig's sea cucumber | - | Mediterranean Sea | Rediscovered | Access |