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 var. tortuosa,
cell body 120 μm long (including tail), 50 μm wide, L/W=2.4,
x 400, x 640, No.1, Iyari marsh, Omachi city, Nagano Pref., Japan, June 4, 2007 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
Images of collecting locality:
No.1, Karakemi marsh, Yasaka, Omachi city (formerly Yasaka village), Nagano Pref., Japan, June 4, 2007 by Y. Tsukii