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Euglenophyceae: Euglenales
Mastigophora: Euglenida

Phacus torta
or Phacus tortus
(Lemmermann) Skvortzow, 1928

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, cell body 48 μm long, 39 μm wide, cauda 23 μm long, tail about half of the cell body length, x 640, Japan, 1999 by Y. Tsukii

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