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Euglenophyceae: Euglenales
Mastigophora: Euglenida

 Phacus triqueter
(Ehrenberg) Dujardin 1841

Phacus triqueter Genus: Highly flattened; pellicle firm; body form constant (Kudo, 1966). Chloroplasts small, discoid, pyrenoids usually absent; most species flat and leaf-shaped; often with ridges or fins running helically or longitudinally (Illustrated Guide, 1985).
Species: Cell body 37-68 μm long, 25-45 μm wide, dorsally broad ovoidal, cauda relatively long and curved, striae straight, a longitudinal prominent ridge at the center which makes frontal view triangular; a locomotive flagellum nearly the same as the cell body in length; paramylon bodies large disc-shaped, 1-2 in number (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).
Similar species -- >> P. pleuronectes;

Phacus triqueter (Ehrenberg) Dujardin 1841, cell body 44 μm long, 37 μm wide, with short cauda slightly curved, a ridge on the convex side, longitudinally striated, one circular paramylon body present at center, x 400, x 640, Higashi-Urawa (Minuma-tanbo), Saitama Pref., Japan, June 2001 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Phacus Phacus Phacus Phacus Phacus Phacus Phacus Phacus

Phacus curvicauda Swirenko: Cell body 24-26 μm diam., (25)-38-30 μm long; 2 paramylons (Illustrations of The Japanese Fresh-water Algae, 1977).

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