| Dalyellia sergia Beklemischev, 1919 | | w | latest taxonomic authority | |
| Dalyellia arctica Nasonov, 1923 | | w | primary taxonomic authority (describer) | |
| Dalyellia horrida Nasonov, 1923 | | w | primary taxonomic authority (describer) | |
| Microdalyellia arctica (Nasonov, 1923) | [with synonyms] | w | primary taxonomic authority (describer) | |
| Microdalyellia taurica (Nasonov, 1923) | | w | primary taxonomic authority (describer) | |
| Dalyelliidae Sergia Nasonov, 1923 | | w | primary taxonomic authority (describer) | |
| Krumbachia opaca (Nasonov, 1923) | | w | primary taxonomic authority (describer) | |
| Typhloplanella sexmaculata Nasonov, 1923 | [with synonyms] | w | primary taxonomic authority (describer) | |
| Castrella (Castrella) vernalis Beklemischev, 1921 | | w | other taxonomic work | |
| Dalyelliidae Neosergia Nasonov, 1923 | [with synonyms] | - | primary taxonomic authority (describer) | |