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Euglenophyceae: Euglenales
Mastigophora: Euglenida

 Phacus longicauda
(Ehrenberg) Dujardin 1841

Phacus longicauda 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: 120-170 μm long, 45-70 μm wide; usually slightly twisted; a long caudal prolongation; flagellum about 1/2 body length; stigma prominent; a discoidal paramylon (paramylum) body central; pellicle longitudinally striated (Kudo, 1966).
var. longicauda: cell body 85-170 μm long, 45-70 μm wide; locomotive flagellum shorter than the cell body; a single paramylon body ring shaped (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).

Phacus longicauda (Ehrenberg) Dujardin 1841, cell body 150 μm long (including tail, 60 μm long), 56 μm wide, L/W=, x 640, Kamogawa Daiichi Choseichi (water reservoir), near Mihashi Park, Saitama city (Omiya), Saitama Pref., Japan, July 30, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Phacus longicauda Phacus longicauda Phacus longicauda Phacus longicauda

Images of collecting locality: Kamogawa Daiichi Choseichi (water reservoir), near Mihashi Park, Saitama city (Omiya), Saitama Pref., Japan, July 30, 2006 by Y. Tsukii

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