| author | date | title | journal / publication | Krivorotkin RS, Timoshkin OA | 2025 | New and rare species of microturbellarians of the genus Opisthocystis Sekera, 1911 (Plathelminthes, Kalyptorhynchia, Polycystididae) from Lake Baikal | Biology Bulletin 52(12): [doi: 10.1134/s1062359026700019 goto] |
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| Opisthocystis bilobatus (Nasonov, 1935) | [with synonyms] | w | latest taxonomic authority | |
| Opisthocystis campanulatus (Nasonov, 1935) | [with synonyms] | w | latest taxonomic authority | |
| Opisthocystis multifidus (Nasonov, 1935) | [with synonyms] | w | latest taxonomic authority | 13 |
| Opisthocystis trifidus (Nasonov, 1935) | [with synonyms] | w | latest taxonomic authority | |
| Opisthocystis umylinae Timoshkin, 2010 | w | latest taxonomic authority | 17 | |
| Opisthocystis octopropagostylus Lukhnev and Timoshkin, 2014 | w | latest taxonomic authority | 16 | |
| Opisthocystis irregularis (Nasonov, 1935) | [with synonyms] | w | latest taxonomic authority | |
| Opisthocystis zaytsevae Krivorotkin & Timoshkin, 2025 | - | primary taxonomic authority (describer) | 4 | |
| Opisthocystis strictostylus Krivorotkin & Timoshkin, 2025 | - | primary taxonomic authority (describer) | 6 | |
| Opisthocystis sekeri Krivorotkin & Timoshkin, 2025 | - | primary taxonomic authority (describer) | 9 | |
| Opisthocystis tenuistylus Krivorotkin & Timoshkin, 2025 | - | primary taxonomic authority (describer) | 10 | |
| Opisthocystis bicurvatus Nasonov, 1935 | - | latest taxonomic authority |