Pterocystis echinata
Pterocystis echinata, 20 µm

Raineriophrys echinata (Rainer, 1968) Mikrjukov, 2000

Diagnosis: Cells with a diameter of 25-30 µm. Spine-scales 10-20 µm, with a strongly bent shaft, subcentrally attached to a more or less circular or coniform basal plate. Laterally two small triangular wings connect the basal part of the shaft to the membrane. Both wings extend along the whole shaft as two narrow bands, ornamented with a small number of sharply pointed teeth. The plate-scales are oblong ovoid, 4.7 to 8.0 x 2.2-3.4 µm. The upper surface is slightly convex, the lower surface concave with a longitudinal rodlike axial protrusion. Surface structure smooth.

Ecology: Fresh waters, in Germany, The Netherlands, Central Russia.
I found this species recently in water with Sphagnum contact: Laegieskamp and Fochteloërveen. I have found this species in the same material as Acanthocystis dresscheri (a small moorland pool, pH 5.5, the Netherlands).

Pterocystis echinata
Raineriophrys echinata
Dried spine-scales show the teeth on the shafts (arrows)
Rainerophrys echinata
Skeleton
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