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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, short tail, chloroplast disc-shaped, cell body 84 μm long, 59 μm wide, tail 60 μm long, flagellum about μm long, x 400, x 640, Saitama Pref., Japan, May-June 1999, 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 longicauda Phacus longicauda Phacus longicauda Phacus longicauda Phacus longicauda Phacus longicauda Phacus longicauda

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