| Stenostomum leucops (Duges, 1828) | 1926 or earlier | | | Leningrad province. |
| Stenostomum unicolor Schmidt, 1848 | 1926 or earlier | | | Leningrad province. |
| Stenostomum grande Child, 1902 | 1926 or earlier | | | Leningrad province. |
| Stenostomum tenuicauda Graff, 1911 | 1926 or earlier | | | Leningrad province. |
| Stenostomum agile Silliman, 1885 | 1926 or earlier | | | Leningrad province. |
| Catenula lemnae Duges, 1832 | 1926 or earlier | | | Leningrad province. |
| Rhynchoscolex simplex Leidy, 1852 | 1926 or earlier | | | Leningrad province. |
| Microstomum lineare (Müller, 1773) | 1926 or earlier | | | Leningrad province. |
| Microstomum giganteum Hallez, 1878 | 1926 or earlier | | | Leningrad province. |
| Macrostomum appendiculatum Fabricius, 1826 | 1926 or earlier | | | Leningrad province. |
| Macrostomum viride (1) Beneden E, 1870 | 1926 or earlier | | | Leningrad province. |
| Macrostomum obtusum Vejdovsky, 1895 | 1926 or earlier | | | Leningrad province. |
| Provortex sphagnorum (Sekera, 1912) | 1926 or earlier | | | Leningrad province. |
| Dalyellia expedita Hofsten N, 1907 | 1926 or earlier | | | Leningrad province. |
| Dalyellia sibirica (Plotnikow, 1905) | 1926 or earlier | | | Leningrad province. |
| Dalyellia rubra (Fuhrmann, 1894) | 1926 or earlier | | | Leningrad province. |
| Dalyellia chlynovica occidentalis Nasonov, 1920 | 1926 or earlier | | | Leningrad province. |
| Dalyellia fairchildi Graff, 1911 | 1926 or earlier | | | Leningrad province. |
| Dalyellia picta (Schmidt, 1848) | 1926 or earlier | | | Leningrad province. |
| Dalyellia hallezii Graff, 1882 | 1926 or earlier | | | Leningrad province. |
| Dalyellia karisalmica Nasonov, 1917 | 1926 or earlier | | | Leningrad province. |
| Dalyellia nanella Beklemischev, 1921 | 1926 or earlier | | | Leningrad province. |
| Dalyellia fusca (Fuhrmann, 1894) | 1926 or earlier | | | Leningrad province. |
| Dalyellia armigera Schmidt, 1861 | 1926 or earlier | | | Leningrad province. |
| Dalyellia schmidtii (Graff, 1882) | 1926 or earlier | | | Leningrad province. |
| Dalyellia kupelwieseri Meixner, 1915 | 1926 or earlier | | | Leningrad province. |
| Dalyellia mollosovi Nasonov, 1920 | 1926 or earlier | | | Leningrad province. |
| Dalyellia virgulifera (Plotnikow, 1906) | 1926 or earlier | | | Leningrad province. |
| Dalyellia penicilla (Braun, 1885) | 1926 or earlier | | | Leningrad province. |
| Dalyellia infundibuliformis (Fuhrmann, 1894) | 1926 or earlier | | | Leningrad province. |
| Castrella (Castrella) truncata (Abildgaard, 1789) | 1926 or earlier | | | Leningrad province. |
| Gieysztoria sibirica (Plotnikow, 1905) | 1926 or earlier | | | Russland. Gouv. Leningrad, permanenter Waldtümpel beim Mollosowo-See; Graben bei Ligowo; Parkgraben des Peterhofer Instituts, Mai, 10-12 C. (Nasonov 1926 |
| Dendrocoelum lacteum (Müller, 1773) | 1926 or earlier | | | In Russland ist sie sehr häufig in der Neva und der Umgebung von Leningrad. |
| Microdalyellia kupelwieseri (Meixner, 1915) | 1926 or earlier | | | gouv. Leningrad, u.a. Peterhof |
| Castrada (Castrada) hofmanni Braun, 1885 | 1921 or earlier | | | Leningrad, Finnischer Meerbusen, massenhaft auf Potamogeton. |
| Castrada (Castrada) intermedia (Volz, 1898) | 1926 or earlier | | | |
| Castrada (Castrada) viridis Volz, 1898 | 1921 or earlier | | | Russland: Leningrad, Finnischer Meerbusen, auf Potamogeton. |
| Castrada (Castrada) neocomensis Volz, 1898 | 1926 or earlier | | | Russland: Umgeb. v Leningrad, Ligovo. |
| Castrada (Castrada) spinulosa Hofsten N, 1907 | 1921 or earlier | | | Russland, weitere Umgebung von Leningrad, >>Seen>>, kein näherer Fundort. |
| Castrada (Castradella) granea Braun, 1885 | 1918 or earlier | | | Russland: Leningrad und Umgebung |
| Olisthanella opistomiformis Nasonov, 1924 | 1926 or earlier | | | Umgebung von Leningrad, in Teichen mit Humuswasser, und in Sümpfen am Ufer der Nevabucht des Finnischen Meerbusens, Mai bis September. Schwimmt sehr schnell, macht Tauchbewegungen... |
| Mesostoma ehrenbergii (Focke, 1836) | 1926 or earlier | | | |
| Macrostomum distinguendum Papi, 1951 | 1960 or earlier | | | Russland: Umgebung von Leningrad; Sudmir; Perm; Tomsk (Beklemischev). |
| Microdalyellia armigera (Schmidt, 1862) | 1924 or earlier | | | |
| Microdalyellia schmidtii (Graff, 1882) | 1926 or earlier | | | Umgebung von Leningrad: Ligowo |
| Microdalyellia fusca (Fuhrmann, 1894) | 1926 or earlier | | | Leningrad in Pfützen u. Gräben |
| Microdalyellia brevispina (Hofsten, 1911) | 1924 or earlier | | | Gouv. Leningrad. |
| Microdalyellia brevimana (Beklemischev, 1921) | 1926 or earlier | | | Umgebung von Leningrad |
| Microdalyellia rossi (Graff, 1911) | 1926 or earlier | | | Umgebung von Leningrad |
| Gieysztoria expedita (Hofsten N, 1907) | 1924 or earlier | | | Gouv. Leningrad, Tümpel u. Teiche. |
| Gieysztoria chlynovica (Nasonov, 1919) | 1919 or earlier | | | Umgebung von Leningrad, nicht eintrocknende Wasseransammlungen in sumpfigem Wald zwischen Alexandrino und Ligowo |
| Gieysztoria rubra (Fuhrmann, 1894) | 1921 or earlier | | | Umgebung von Leningrad, Waldpfützen mit totem Laub, Pavlowsk, Parktümpel |
| Gieysztoria virgulifera (Plotnikow, 1906) | 1921 or earlier | | | Umgeb. v. Leningrad in Seen u. Teichen sowie in kleinen Becken mit stehendem Wasser am Ufer der Nevabucht, also wohl in stark ausgesüsstem Wasser des Finnischen Meerbusens, wie Finnland. |
| Gieysztoria infundibuliformis (Fuhrmann, 1894) | 1924 or earlier | | | Umgebung v. Leningrad, Gorwaldai-See |
| Sergia sergia (Beklemischev, 1918) | Aug 6-19, 1916 | | | Umgebung von Leningrad: Ufer des Finnischen Meersbusens, Graben mit Elodea beim Kloster Sergijewa Pustyn. |
| Castrella (Nasonoviella) lutheri (Nasonov, 1917) | 1921 or earlier | | | Leningrad, See Lemoje. |
| Castrella (Castrella) truncata (Abildgaard, 1789) | 1921 or earlier | | | |