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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 body 114 μm long (including tail, 37 μm long), 48 μm wide, L/W=, x 640, Suga-daira marsh, Ueda city, Nagano Pref., Japan, July 6, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Phacus torta Phacus torta

Images of collecting locality: Suga-daira marsh, Ueda city, Nagano Pref., Japan, July 6, 2006 by Y. Tsukii

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