Platyhelminthes (Flat Worms)
Class: Cestoda
Order: Onchoproteocephalidea
Family: Onchobothriidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Acanthobothrium cartagenense | Brooks & Mayes, 1980 | - | - | Quintana Roo, México | Rediscovered | Access |
Class: Rhabditophora
Order: Fecampiida
Family: Fecampiidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Fecampia erythrocephala | Giard, 1886 | - | - | Europe | Rediscovered | Access |
Order: Proseriata
Family: Otoplanidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Orthoplana bregazzii | Karling, 1973 | (rediscovered) | Antarctica | Rediscovered | Access |
Order: Tricladida
Family: Cercyridae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
|
Oregoniplana pantherina |
Sluys, 1989 | - | (rediscovered) | South Africa | Rediscovered | Access |
Family: Dugesiidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Romankenkius pedderensis | Ball, 1974 | Lake Pedder planarian | - | Lake Pedder, Tasmania, Australia | Rediscovered | Access |
Family: Geoplanidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
|
Amaga expatria
|
Jones & Sterrer, 2005 | (rediscovered) | Bermuda, Guadeloupe & Martinique | Rediscovered | Access |
Family: Kenkiidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Sphalloplana holsingeri | Kenk, 1977 | Holsinger's groundwater planarian | ? | Illinois & Virginia, USA | Extinct | Access |
Class: Trematoda
Order: Stichocotylida
Family: Stichocotylidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Stichocotyle nephropis | Cunningham, 1884 | - | 1986 | Atlantic Ocean & North Sea | Extinct | Access |