| Macrostomum infundibuliferum Plotnikow, 1905 | | w | latest taxonomic authority | |
| Microstomum mundum Graff, 1905 | | w | latest taxonomic authority | |
| Microstomum paradii Graff, 1913 | [with synonyms] | w | latest taxonomic authority | |
| Castrella (Castrella) cylindrica Riedel, 1932 | | w | primary taxonomic authority (describer) | 100-102, Textfig. 10, 11 |
| Castrella (Castrella) groenlandica Riedel, 1932 | | w | primary taxonomic authority (describer) | 102-106, Textfig. 12, 13, 14 |
| Dalyellia deses Riedel, 1932 | | w | primary taxonomic authority (describer) | 91-92, Textfig. 1, 2 |
| Dalyellia groenlandica Riedel, 1932 | | w | primary taxonomic authority (describer) | 93-94, Textfig. 3, 4, 5 |
| Dalyellia minima Riedel, 1932 | | w | primary taxonomic authority (describer) | 95, Textfig. 6 |
| Gieysztoria minima (Riedel, 1932) | [with synonyms] | w | primary taxonomic authority (describer) | 95, f. 6 |
| Microdalyellia deses (Riedel, 1932) | [with synonyms] | w | primary taxonomic authority (describer) | |
| Microdalyellia groenlandica (Riedel, 1932) | [with synonyms] | w | primary taxonomic authority (describer) | |
| Microdalyellia minima (Riedel, 1932) | | w | primary taxonomic authority (describer) | |
| Dolichomacrostominae Paramacrostomum Riedel, 1932 | | w | primary taxonomic authority (describer) | |
| Paramacrostomum tricladoides Riedel, 1932 | | w | primary taxonomic authority (describer) | 82-84, Textfig. 2a, b, 3-5, 7, 18, 19a, b, 20; Taf |
| Macrostomum anocele Riedel, 1932 | | w | primary taxonomic authority (describer) | |
| Macrostomum boreale Riedel, 1932 | [with synonyms] | w | primary taxonomic authority (describer) | 81-82, textfig. 15, 16, 27; Tafelfig. 1 a, 5, 8, 1 |
| Macrostomum thermophilum Riedel, 1932 | | w | primary taxonomic authority (describer) | 79-80, Textfig. 14, 17, 26; Tafelfig. 1c, 6a, b |
| Microstomum dermophthalmum Riedel, 1932 | | w | primary taxonomic authority (describer) | 73-73, Textfig. 8, 12, 21; Tafelfig. 4a, b |
| Microstomum jenseni Riedel, 1932 | [with synonyms] | w | primary taxonomic authority (describer) | 75-77, Textfig. 1, 9, 10, 11, 22, 23; Tafelfig. 7, |
| Microstomum mortenseni Riedel, 1932 | | w | primary taxonomic authority (describer) | 77-79, Textfig. 13, 24, 25; Tafelfig. 2 9 |
| Dalyellia coronaria (Schmidt, 1858) | [with synonyms] | w | other taxonomic work | 92 |
| Dalyellia bardeaui Steinböck, 1926 | | w | other taxonomic work | 95-100, Textfig. 7, 8, 9 |
