Genus (Aragoa): Cell body ovoid or pyriform with conical or pointed posterior end;
4 equal-length flagella inserted at the base of a papilla; cells colorless; eyspot present or absent;
1-layered cysts common; 2 anterior contractile vacuoles; cell division by longitudinal fission;
sexual reproduction isogamous to form a 4-flagellate zygote (Illustrated Guide, 1985).
Species: Cell body narrowly egg-shaped; a small papilla present; no eyespot (John et al. 2002).
stock Sim-1, axenic culture with EM (June 9 to June 12, 2003, in a test tube),
cell body μm long, μm wide,
cytoplasm gathered at posterior half of the cell body,
x 640, Near Chyokyu-ji (temple), Miyadera, Iruma city, Saitama Pref., Japan, May 2003 by Y. Tsukii
stock Sim-2?, axenic culture (February 4 to March 7, 2006),
cysts 10-13 μm in diam.,
x 400, x 640, Japan, 2006 by Y. Tsukii