Annelida (Annelid Worms)
Class: Clitellata
Subclass: Hirudinea
Order: Arhynchobdellida
Family: Hirudinidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Macrobdella sestertia | Whitman, 1886 | New England medicinal leech | (rediscovered) | Eastern USA | Rediscovered | Access |
Family: Xerobdellidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Xerobdella lecomtei | von Frauenfeld, 1868 | European land leech | 2001-2005 | Birch forests near Graz, Austria | Missing | Access |
Subclass: Oligochaeta
Order: Megadrilaceae
Family: Glossoscolecidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Fimoscolex sporadochaetus | Michaelsen, 1918 | - | (rediscovered) | Brazil | Rediscovered | Access |
| Rhinodrilus fafner | Michaelsen, 1918 | Giant Brazilian earthworm | 1912 | Minas Gerais state, Brazil | Extinct | Access |
Family: Megascolecidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Amynthas japonicus | (Horst, 1883) | Yamatomimizu | 1820's | "Japan" | Extinct1 | Access |
| Aporodrilus mortenseni | (Michaelsen, 1924) | - | 1915 | North Island, New Zealand | Missing | Access |
| Driloleirus americanus | Smith, 1897 | Giant Palouse earthworm | (rediscovered) | Idaho & Washington, USA | Rediscovered | Access |
| Driloleirus macelfreshi | (Smith, 1937) | Oregon giant earthworm | (rediscovered) | Oregon, USA | Rediscovered | Access |
| Hypolimnus pedderensis | Jamieson, 1974 | Lake Pedder earthworm | 1971 | Tasmania, Australia | Extinct | Access |
| Megascolex travancorensis bonaccordensis | Michaelsen, 1913 | - | (rediscovered) | Kerala state, India | Rediscovered | Access |
| Tokea orthostichon | (Schmarda, 1861) | Schmarda's worm | 1854 | North Island, New Zealand | Extinct | Access |
1 Rob Blakemore, pers. comm. 15 December 2018.
Order: Opisthopora
Family: Acanthodrilidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Maoridrilus felix felix | Blakemore, 2010 | - | 2010 | South Island, New Zealand | Missing | Access |
| Maoridrilus felix vallis | Blakemore, 2010 | - | 2010 | South Island, New Zealand | Missing | Access |
Family: Octochaetidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Octochaetus levis | (Hutton, 1877) | - | 1876 | South Island, New Zealand | Missing | Access |
| Octochaetus microchaetus | (Benham, 1950) | - | 1876 | South Island, New Zealand | Missing | Access |
Class: Polychaeta
Order: Eunicida
Family: Eunicidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Leodice laurillardi | (Quatrefages, 1866) | - | (rediscovered) | Europe | Rediscovered | Access |
Order: Phyllodocida
Family: Hesionidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Oxydromus humesi | (Pettibone, 1961) | - | (rediscovered) | Afro-Europe | Rediscovered | Access |
Family: Phyllodocidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Nereiphylla pusilla | Claparède, 1870 | - | (rediscovered) | Sicily, Italy | Rediscovered | Access |