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Euglenophyceae: Euglenales
Mastigophora: Euglenida

Phacus curvicauda
Swirenko, 1915

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 25-30 μm long, 24-26 μm wide, broad ovoid or nearly spherical at dorsal view; dorso-ventrally grooved; tail region short, not straight; two disc-shaped paramylons; a flagellum two-times longer than the body length (An illustrated guide to freshwater zooplankton in Japan, 2000).

Phacus curvicauda Swirenko 1915 ?, cell body μm long, μm wide, Japan, 199? by Y. Tsukii

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