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Euglenophyceae: Euglenales
Mastigophora: Euglenida

Phacus triqueter
(Ehrenberg) Dujardin 1841

Phacus 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 without cauda 37 μm long, 36 μm wide, cauda 11 μm long, x 640, Omachi natural park, Ichikawa city, Chiba Pref., Japan, September 2001 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Phacus Phacus Phacus


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