| Procerodes ulvae (Ørsted, 1843) | 1932 or earlier |  |  | Jekaterinhafen. | 
| Uteriporus vulgaris Bergendal, 1890 | 1932 or earlier |  |  | under rocks, Jekaterinhafen. | 
| Notentera ivanovi Joffe, Selivanova & Kornakova, 1997 | prior to 1997 |  |  | from the digestive tract of a polychaete Nephthis ciliata from the White Sea. | 
| Baicalellia pusilla (Luther, 1962) | 1988 or earlier |  |  |  | 
| Alauretta viridirostrum Mereschkowsky, 1878 | 1878 or earlier |  |  |  | 
| Prostomum boreale Mereschkowsky, 1878 | 1878 or earlier |  |  |  | 
| Prostomum papillatum Mereschkowsky, 1878 | 1878 or earlier |  |  |  | 
| Mesostomum graffi Mereschkowsky, 1878 | 1878 or earlier |  |  |  |