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Euglenophyceae: Euglenales
Mastigophora: Euglenida

 Phacus gigas
Da Cunha

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: Cell body 100-115 μm long,m, 70-80 μm wide (Ciugulea I. & Triemer R.E., A Color Atlas of Phtosyntetic Euglenoids, Michigan State University Press, 2010).

Phacus gigas Da Cunha, cell body 130 μm long (including cauda, 30 μm long), 88 μm wide, L/W=, x 640, Suiren-ike (water-lily pond), Mizumoto Park, Katsushika-ku, Tokyo, Japan, October 22, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Phacus gigas Phacus gigas Phacus gigas Phacus gigas Phacus gigas Phacus gigas Phacus gigas Phacus gigas

Images of collecting locality: Suiren-ike (water-lily pond), Mizumoto Park, Katsushika-ku, Tokyo, Japan, October 22, 2006 by Y. Tsukii

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