| Macrostomum orthostylum Braun, 1885 | Aug 8, 1917 | | | Vammelsuu. |
| Opistomum arsenii Nasonov, 1917 | 1918 or earlier | | | Terijoki. |
| Castrada (Castradella) granea Braun, 1885 | Jun 14-27, 1917 | | | Bloss einmal innerhalb des Gebietes gefunden: Terijoki, Graben in einem Park, 4 Exx. |
| Olisthanella palmeni Nasonov, 1917 | 1918 or earlier | | | |
| Rhynchoscolex simplex Leidy, 1852 | 1955 or earlier | | | Terijoki, in einem wenig tiefen Brunnen (Beklemischev) |
| Macrostomum lutheri Beklemischev, 1927 | Jul 28, 1917 | | | Terijoki, See >>Tschutsche>> an Nymphaea. |
| Microdalyellia brevimana (Beklemischev, 1921) | 1921 or earlier | | | |