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Euglenophyceae: Euglenales
Mastigophora: Euglenida

 Phacus pyrum
(Ehrenberg) F. Stein 1878

Phacus pyrum 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: About 30-50 μm long, 10-20 μm wide; circular in cross section; with caudal prolongation; pelicle obliquely ridged; flagellum as long as the body (Kudo, 19660). Cell body 28-55 μm long, 10-21 μm wide two paramylons thick disc-shaped, parietal (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).

Phacus pyrum (Ehrenberg) Stein, cell body 40 μm long, 14 μm wide, L/W=, x 640, No.2, Kashiwa Village Mizube Park, Kashiwa city, Chiba Pref., Japan, February 11, 2008 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Phacus pyrum Phacus pyrum

Images of collecting locality: Kashiwa Village Mizube Park, Kashiwa city, Chiba Pref., Japan, February 11, 2008 by Y. Tsukii

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