| Mesostoma ehrenbergii (Focke, 1836) | 1929 or earlier |  |  |  | 
| Bothromesostoma primitivum Sabussowa, 1929 | 1929 or earlier |  |  | from various ponds, lakes and streams. | 
| Sorocelis relicta Sabussowa, 1929 | 1929 or earlier |  |  | from various ponds, lakes and streams. | 
| Bdellocephala kamtschatica Zabusova, 1929 | 1929 or earlier |  |  | from various ponds, lakes and streams. | 
| Bdellocephala mediobuccalis Zabusova, 1929 | 1929 or earlier |  |  | from various ponds, lakes and streams. | 
| Sorocelis eudendrocoeloides Sabussowa, 1929 | 1929 or earlier |  |  | from various ponds, lakes and streams. | 
| Sorocelis elongata Sabussowa, 1929 | 1929 or earlier |  |  | from various ponds, lakes and streams. | 
| Polycelis schmidti (Zabusov, 1916) | 1916 or earlier |  |  | Northeast Siberia and Kamchatka. | 
| Mesostoma ehrenbergii (Focke, 1836) | 1929 or earlier |  |  |  |