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Euglenophyceae: Euglenales
Mastigophora: Euglenida

 Phacus torta
(Lemmermann) Skvortzow var. tortuosa Skvortzow
or Phacus helikoides Pochmann

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: 80-100 μm; similar to P. longicauda; twisted 40-60 degree (How to know the protozoa, 1979).
Var. tortuosa: twisted about 90 degree.

Phacus torta var. tortuosa, cell 104 μm long (body 66 μm, tail 38 μm), 37 μm wide, x 640, Mihashi Park, Saitama city (Omiya), Saitama Pref., Japan, October 2002 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 Phacus Phacus Phacus Phacus

Phacus torta var. tortuosa, cell 86 μm long (body 54 μm, tail 33 μm), 42 μm wide, x 640, Mihashi Park, Saitama city (Omiya), Saitama Pref., Japan, October 2002 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 Phacus

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