| Dalyellia oligochaeta Nasonov, 1920 | | w | latest taxonomic authority | |
| Dalyellia taurica Nasonov, 1923 | | w | latest taxonomic authority | |
| Dalyellia fairchildi oligochaeta Nasonov, 1924 | | w | primary taxonomic authority (describer) | |
| Microdalyellia brevimana (Beklemischev, 1921) | [with synonyms] | w | other taxonomic work | |
| Mesostoma ajpetri Nasonov, 1924 | | w | primary taxonomic authority (describer) | |
| Mesostoma climenti Nasonov, 1924 | | w | primary taxonomic authority (describer) | |
| Olisthanella opaca Nasonov, 1924 | | w | primary taxonomic authority (describer) | |
| Olisthanella opistomiformis Nasonov, 1924 | [with synonyms] | w | primary taxonomic authority (describer) | 14 |
| Krumbachia opisthoformis (Nasonov, 1924) | | w | primary taxonomic authority (describer) | 14 |
| Castrada (Castrada) tatarica Nasonov, 1924 | | w | primary taxonomic authority (describer) | |
| Strongylostoma levandovskii Nasonov, 1924 | | w | primary taxonomic authority (describer) | |
| Macrostomum nassonovi (Nasonov, 1921) | [with synonyms] | w | other research on this sp. | |
| Gieysztoria cuspidata (Schmidt, 1861) | [with synonyms] | w | other research on this sp. | |