Family: Colorless body; two flagella, one directed anteriorly and the other usually
posteriorly; stigma absent.
Genus: Oval, flattened, longitudinally striated; anterior flagellum about four times longer
than shorter trailing one; fresh or salt water (How to know the protozoa, 1979).
Species:
Marsupiogaster sp.,
cell body 25 μm long, 15 μm wide, L/W=1.7,
anterior flagellum 50 μm long, recurrent flagellum 30 μm long,
x 640, Onnenai, Kushiro marsh, Kushiro city, Hokkaido, Japan, October 16, 2005 by Y. Tsukii 50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
Marsupiogaster striata (Schewiakoff):
27 μm long (How to know the protozoa, 1979).