Genus: Body blunt at rear; kineties spiralled when body contracts (Illustrated Guide, 1985).@
Species: 500-600 μm long;
with slender, tapered "tail" (How to know the protozoa, 1979).
500-800 μm long;
macronucleus moniliform (Kudo, 1966).
Spirostomum minus Roux,
cell body μm long, μm wide, L/W=,
x 640, Kareki-numa marsh, Nikko city (formerly Fujiwara town), Tochigi Pref., Japan, September 24, 2008 collected by Eizaburo Tsukii, photo by Y. Tsukii
200 μm
300 μm
600 μm; x 100