| 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 | broken concrete | South-east shore.  Broken concrete.  Vegetation, Phragmites, a little Typha, little detritus.  11-30 individuals per hour. | 
| Dendrocoelum lacteum (Müller, 1773) | Jun 7-12, 1971 | littoral | vegetation | South-east shore.  Broken concrete.  Vegetation, Phragmites, a little Typha, little detritus.  300+ individuals per hour. | 
| Dugesia polychroa (Schmidt, 1861) | Jun 7-12, 1971 | littoral | vegetation | South-east shore.  Broken concrete.  Vegetation, Phragmites, a little Typha, little detritus.  11-30 individuals per hour. | 
| Dugesia polychroa (Schmidt, 1861) | Jun 7-12, 1971 | littoral | broken concrete | South-east shore.  Broken concrete.  Vegetation, Phragmites, a little Typha, little detritus.  31-100 individuals per hour. | 
| Polycelis tenuis Ijima, 1884 | Jun 7-12, 1971 | littoral | broken concrete | South-east shore.  Broken concrete.  Vegetation, Phragmites, a little Typha, little detritus.  11-31 individuals per hour. | 
| Polycelis tenuis Ijima, 1884 | Jun 7-12, 1971 | littoral | vegetation | South-east shore.  Broken concrete.  Vegetation, Phragmites, a little Typha, little detritus.  11-31 individuals per hour. | 
| Castrella (Castrella) truncata (Abildgaard, 1789) | Jun 7-12, 1971 | littoral | broken concrete | South-east shore.  Broken concrete.  Vegetation, Phragmites, a little Typha, little detritus.  1-10 individuals per hour. | 
| Macrostomum distinguendum Papi, 1951 | Jun 7-12, 1971 | littoral | vegetation | South-east shore.  Broken concrete.  Vegetation, Phragmites, a little Typha, little detritus.  1-10 individuals per hour. | 
| Microstomum lineare (Müller, 1773) | Jun 7-12, 1971 | littoral | vegetation | South-east shore.  Broken concrete.  Vegetation, Phragmites, a little Typha, little detritus.  31-100 individuals per hour. | 
| Olisthanella truncula (Schmidt, 1858) | Jun 7-12, 1971 | littoral | vegetation | South-east shore.  Broken concrete.  Vegetation, Phragmites, a little Typha, little detritus.  1-10 individuals per hour. | 
| Stenostomum leucops (Duges, 1828) | Jun 7-12, 1971 | littoral | broken concrete | South-east shore.  Broken concrete.  Vegetation, Phragmites, a little Typha, little detritus.  1-10 individuals per hour. |