| Rhynchoscolex sp. (Plotnikow 1900) | 1913 or earlier |  |  |  | 
| Macrostomum tuba Graff, 1882 | 1913 or earlier |  |  |  | 
| Dalyellia virgulifera (Plotnikow, 1906) | 1906 or earlier |  |  |  | 
| Castrada (Castrada) otophthalma Plotnikow, 1906 | 1906 or earlier |  |  |  | 
| Castrada (Castrada) hofmanni Braun, 1885 | 1913 or earlier |  |  |  | 
| Castrada (Castrada) armata (Fuhrmann, 1894) | 1913 or earlier |  |  | mud of pools and lakes, and littoral zone. | 
| Castrada (Castrada) sp. Plotnikow, 1900 | 1900 or earlier |  |  |  | 
| Mesostoma bologoviense Plotnikow, 1906 | 1906 or earlier |  |  |  | 
| Bothromesostoma essenii Braun, 1885 | 1913 or earlier |  |  |  | 
| Macrostomum tuba Graff, 1882 | prior to 1900 |  |  |  | 
| Vortex virgulifer Plotnikow, 1906 | 1906 or earlier |  |  |  | 
| Opistomum arsenii Nasonov, 1917 | 1906 or earlier |  |  | Russland: Bologoje. | 
| Castrada (Castrada) hofmanni Braun, 1885 | 1906 or earlier |  |  | Bologoje. | 
| Castrada (Castrada) armata (Fuhrmann, 1894) | 1905 or earlier |  |  | Bologoje u. Glubokoje. | 
| Strongylostoma elongatum elongatum Hofsten N, 1907 | 1924 or earlier |  |  |  | 
| Olisthanella truncula (Schmidt, 1858) | 1906 or earlier |  |  |  | 
| Mesostoma ehrenbergii (Focke, 1836) | 1900 or earlier |  |  |  | 
| Bothromesostoma personatum (Schmidt, 1848) | 1906 or earlier |  |  |  | 
| Bothromesostoma essenii Braun, 1885 | 1906 or earlier |  |  |  | 
| Rhynchoscolex simplex Leidy, 1852 | 1900 or earlier |  |  | Gouv. Novgorod, See Bologoje (Plotnikov). | 
| Gieysztoria virgulifera (Plotnikow, 1906) | 1906 or earlier |  |  | Gouv. Novgorod, See Bologoje. | 
| Castrella (Castrella) truncata (Abildgaard, 1789) | 1900 or earlier |  |  | See Bologoje. |