Raphidiophrys coerulea Penard, 1904
Diagnosis: Scales broad ovate, very fine, without distinct border, lightmicroscopically without any structure, in living cells resembling straigth lines, building a closed skeleton; some scales radially arranged at the base of the axopods. Several contractile vacuoles; axopodia very fine with hard to observe granules.
Dimensions: Scale size 3 -2 µm; skeleton 8-18 µm.
Ecology: In detritus and between algae. Springtime and summer. Rare. Recorded from Switzerland (Penard 1904), Germany (Rainer 1968) and The Netherlands (Siemensma 1981).