Plagiophrys spec., with minute spines (arrows)
Diagnosis: Sometimes I find specimens of R. scutiformis and R. marginata, with minute spines along the edge and the fundus region. The spines originate from minute conical protrusions. Maybe these spines are species specific, but maybe they are only present under certain conditions.
Arrows point to some spines, detail
Arrows point to some spines. Test with spines at the fundus.
Plagiophrys scutiformis with some spines at the edge - Neer-river, Limburg.
The same cell as before, but now with some distinct dots at the fundus. These dots are spines.
Test 52 µm - Neerriver, Limburg