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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, cell body 142 μm long (with tail), body 81 μm long, 60 μm wide, tail 61 μm long, flagellum about 90 μm long, x 400, Japan, 199? by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400
Phacus longicauda Phacus longicauda

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