| Microdalyellia infundibuliformis (Fuhrmann, 1894) | | w | latest taxonomic authority | |
| Microdalyellia rubra (Fuhrmann, 1894) | | w | latest taxonomic authority | |
| Microdalyellia semispinosa (Fulinski & Szynal, 1927) | | w | latest taxonomic authority | |
| Microdalyellia sibirica (Plotnikow, 1905) | | w | latest taxonomic authority | |
| Castrella (Nasonoviella) lutheri (Nasonov, 1917) | [with synonyms] | w | other taxonomic work | |
| Gieysztoria lugubris wigrensis (Gieysztor, 1938) | [with synonyms] | w | other taxonomic work | 4, 6, 52 |
| Rhynchoscolex simplex Leidy, 1852 | [with synonyms] | w | other research on this sp. | |
| Macrostomum orthostylum Braun, 1885 | | w | other taxonomic work | |
| Gieysztoria cuspidata (Schmidt, 1861) | [with synonyms] | w | other research on this sp. | |
| Dalyellia ornata drozdovicensis Fulinski, 1915 | | w | latest taxonomic authority | 29 |
| Microdalyellia kharkowiensis (Markow, 1904) | [with synonyms] | w | other taxonomic work | |