| 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 | | | |