| Polycystis angarensis Sibiriakova, 1929 | | w | other taxonomic work | 201-203 |
| Polycystis bilobata Nasonov, 1935 | | w | primary taxonomic authority (describer) | |
| Polycystis campanulata Nasonov, 1935 | | w | primary taxonomic authority (describer) | |
| Polycystis irregulatus Nasonov, 1935 | | w | primary taxonomic authority (describer) | |
| Polycystis multifida Nasonov, 1935 | | w | primary taxonomic authority (describer) | |
| Castrada (Castrada) armata (Fuhrmann, 1894) | [with synonyms] | w | other taxonomic work | 195 |
| Macrostomum auriculatum Nasonov, 1935 | | w | primary taxonomic authority (describer) | |
| Opisthocystis bilobatus (Nasonov, 1935) | [with synonyms] | w | primary taxonomic authority (describer) | |
| Opisthocystis campanulatus (Nasonov, 1935) | [with synonyms] | w | primary taxonomic authority (describer) | |
| Opisthocystis multifidus (Nasonov, 1935) | [with synonyms] | w | primary taxonomic authority (describer) | |
| Opisthocystis trifidus (Nasonov, 1935) | [with synonyms] | w | primary taxonomic authority (describer) | |
| Polycystis trifida Nasonov, 1935 | | w | primary taxonomic authority (describer) | |
| Castrada (Castrada) baicalensis Nasonov, 1935 | | w | primary taxonomic authority (describer) | 200-201 |
| Polycystis irregularis Nasonov, 1935 | | w | primary taxonomic authority (describer) | |
| Opisthocystis irregularis (Nasonov, 1935) | [with synonyms] | w | primary taxonomic authority (describer) | |
| Opisthocystis bicurvatus Nasonov, 1935 | | - | primary taxonomic authority (describer) | |