Species: 45-100 μm long, 30-70 μm wide; short posterior prolongation
slightly curved; a prominent ridge on the convex side; longitudinally striated;
one ? circular paramylon (paramylum) body near center; flagellum as long as cell body (Kudo, 1966).
Cell body nearly spherical at dorsal view; anterior end separated into two spherical projections;
cauda strongly curved; dorsal ridge short or absent
(cf. dorsal ridge present P. triqueter);
cell body 40-80 μm long, 30-50 μm wide;
two ? paramylon bodies disc-shaped; striae straight
(An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).
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50 μm
100 μm
150 μm; x 400
Phacus undulatus ?
Phacus pleuronectes Swirenko: Cell body 24-26 μm diam., (25)-38-30 μm long; 2 paramylons (Illustrations of The Japanese Fresh-water Algae, 1977).
Similar species:
Phacus obolus Phochmann:
(Syn. Phacus caudatus Hubner var. lata Allorge & Lefevre)
Cell body flat, broad ellipsoid, anterior slightly narrowed, posterior broadly rounded, with long straight cauda,
28-32 μm long without cauda,
20-24 μm wide,
cauda 7-9 μm long,
lateral sides nearly straight, periplasts longitudinally striated, two disc-shaped paramylon bodies,
large and small (Photomicrographs of the freshwater algae, 14:45, 1995).