| author | date | title | journal / publication | Voigt W | 1907 | Wann sind die Strudelwurmarten Planaria alpina, Polycelis cornuta, und Planaria gonocephala in die Quelibaeche an den Blukanen der Eifel eingewandert? | Ber Versamml Botan Zool Ver F Rheinl-Westf p 67-75 |
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| Polycelis cornuta Johnston, 1822 | w | other research on this sp. | ||
| Planaria alpina (Dana, 1766) | w | other research on this sp. | ||
| Planaria gonocephala Duges, 1830 | w | other research on this sp. |