| Oligochoerus limnophilus Ax & Doerjes, 1966 | Jun 7-12, 1971 | littoral | stone | stone embankments and stony shores of the littoral zone. The sixteen Netherlands lakes sampled by the authors are connected by canals, so it is difficult to indentify natural rivers. |
| Dendrocoelum lacteum (Müller, 1773) | Jun 7-12, 1971 | littoral | bricks | East shore. Bricks. Vegetation, Phragmites, little detritus. 11-30 individuals per hour. |
| Dendrocoelum lacteum (Müller, 1773) | Jun 7-12, 1971 | littoral | vegetation | East shore. Bricks. Vegetation, Phragmites, little detritus. 1-10 individuals per hour. |
| Dugesia polychroa (Schmidt, 1861) | Jun 7-12, 1971 | littoral | vegetation | East shore. Bricks. Vegetation, Phragmites, little detritus. 1-10 individuals per hour. |
| Dugesia polychroa (Schmidt, 1861) | Jun 7-12, 1971 | littoral | bricks | East shore. Bricks. Vegetation, Phragmites, little detritus. 1-10 individuals per hour. |
| Polycelis tenuis Ijima, 1884 | Jun 7-12, 1971 | littoral | bricks | East shore. Bricks. Vegetation, Phragmites, little detritus. 1-10 individuals per hour. |
| Polycelis tenuis Ijima, 1884 | Jun 7-12, 1971 | littoral | vegetation | East shore. Bricks. Vegetation, Phragmites, little detritus. 11-30 individuals per hour. |
| Microstomum lineare (Müller, 1773) | Jun 7-12, 1971 | littoral | bricks | East shore. Bricks. Vegetation, Phragmites, little detritus. 11-30 individuals per hour. |