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Raphidocystis flabellata
P. flabellata, a: spine-scales, b: plate-scale – Siemensma, 1991

Pseudoraphidocystis flabellata  (Dürrschmidt, 1987) Mikrjukov, 1997

Diagnosis: Periplast, 10-15 µm in diameter, with two types of scales; details of protoplast unknown. The spine-scales are radial symmetrical, 3.6 µm in diameter and 2.7 µm long, with regularly spaced ribs which are composed of 3-4 smaller ribs. These radiate from the upper end of the stalk to the outer margin. A shaft is not developed. The stalk is short (0.5 µm), smooth, cylindrical and closed on its basal end, however, this delicate layer is often torn. The plate-scales, 1.2-2.0 x 0.7-1.1 µm, are ovoid or elliptical with an axial thickening shifted slightly towards the smaller pole of the scale. Peripheral the scales are sur­rounded with a narrow inflexed rim.

Ecology: Marshes, flooded land; Chile, Germany, New Zealand, Canada (Dürrschmidt, 1987)

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