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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, cell body 57 μm long (without tail), 40 μm wide, tail 15 μm long, x 640, Mizuko-kaizuka park, Fujimi city, Saitama Pref., Japan, May 9, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Phacus triqueter Phacus triqueter Phacus triqueter Phacus triqueter Phacus triqueter Phacus triqueter Phacus triqueter

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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