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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 38 μm long, 15 μm wide, L/W=2.5, x 640, Hasu-ike (lotus pond), Mizumoto Park, Tokyo, Japan, October 22, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Phacus pyrum Phacus pyrum

Images of collecting locality: Hasu-ike (lotus pond), Mizumoto Park, Katshika-ku, Tokyo, Japan, October 22, 2006 by Y. Tsukii


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