| Dalyellia Scoparia Gieysztor, 1934 | | w | latest taxonomic authority | |
| Dalyellia koiwi Eggers, 1925 | | w | latest taxonomic authority | |
| Dalyellia microphthalma (Vejdovsky, 1895) | | w | latest taxonomic authority | |
| Dalyellia picta (Schmidt, 1848) | | w | latest taxonomic authority | |
| Dalyellia picta toutriensis Fulinski & Szynal, 1933 | | w | latest taxonomic authority | |
| Dalyellia picta zarubincensis Fulinski & Szynal, 1933 | | w | latest taxonomic authority | |
| Dalyellia schmidtii (Graff, 1882) | | w | latest taxonomic authority | |
| Microdalyellia armigera microphthalma Nasonov, 1919 | | w | latest taxonomic authority | |
| Microdalyellia foreli (Hofsten N, 1911) | | w | latest taxonomic authority | |
| Microdalyellia lutheri (Nasonov, 1917) | | w | latest taxonomic authority | |
| Microdalyellia ornata (Hofsten N, 1907) | | w | latest taxonomic authority | |
| Microdalyellia picta toutriensis (Fulinski & Szynal, 1933) | | w | latest taxonomic authority | |
| Microdalyellia virgulifer (Plotnikow, 1906) | | w | latest taxonomic authority | |
| Dalyelliidae Dalyellia Gieysztor, 1938 | [with synonyms] | w | primary taxonomic authority (describer) | |
| Dalyellia karisalmica oligochaeta Gieysztor, 1938 | | w | primary taxonomic authority (describer) | |
| Dalyellia karisalmica tabulifera Gieysztor, 1938 | | w | primary taxonomic authority (describer) | |
| Dalyellia penicilla minuta Gieysztor, 1938 | | w | primary taxonomic authority (describer) | as var. minuta, p. 219 |
| Dalyellia tatrica Gieysztor, 1938 | | w | primary taxonomic authority (describer) | 218 |
| Gieysztoria lugubris wigrensis (Gieysztor, 1938) | [with synonyms] | w | primary taxonomic authority (describer) | 235-236 |
| Dalyelliidae Microdalyellia Gieysztor, 1938 | | w | primary taxonomic authority (describer) | 222 |
| Microdalyellia brevimana nasonovi Gieysztor, 1938 | | w | primary taxonomic authority (describer) | |
| Microdalyellia lugubris wigrensis Gieysztor, 1938 | | w | primary taxonomic authority (describer) | 235 |
| Microdalyellia wiszniewskii Gieysztor, 1938 | | w | primary taxonomic authority (describer) | 366-367 |
| Macrostomum catarractae Gieysztor, 1938 | | w | primary taxonomic authority (describer) | 216 |
| Otoplana fluviatilis Gieysztor, 1938 | | w | primary taxonomic authority (describer) | |
| Microdalyellia koiwi (Eggers, 1925) | | w | other taxonomic work | 236 |
| Microdalyellia euchroa (Gieysztor, 1926) | | w | other taxonomic work | 237 |
| Microdalyellia armigera (Schmidt, 1862) | [with synonyms] | w | latest taxonomic authority | |