| Macrostomum | anocele | Riedel, 1932 | |
| Macrostomum | boreale | Riedel, 1932 | |
| (Castrella) | cylindrica | Riedel, 1932 | |
| Microstomum | dermophthalmum | Riedel, 1932 | |
| Dalyellia | deses | Riedel, 1932 | |
| Microdalyellia | deses | (Riedel, 1932) | |
| (Castrella) | groenlandica | Riedel, 1932 | |
| Dalyellia | groenlandica | Riedel, 1932 | |
| Microdalyellia | groenlandica | (Riedel, 1932) | |
| Microstomum | jenseni | Riedel, 1932 | |
| Dalyellia | minima | Riedel, 1932 | |
| Gieysztoria | minima | (Riedel, 1932) | |
| Microdalyellia | minima | (Riedel, 1932) | |
| Microstomum | mortenseni | Riedel, 1932 | |
| Dolichomacrostominae | Paramacrostomum | Riedel, 1932 | |
| Macrostomum | thermophilum | Riedel, 1932 | |
| Paramacrostomum | tricladoides | Riedel, 1932 |
17 names, including those in new combination. (Max listing set to 900)