Genus: Test chitinous, coloured greyish-rose or deep purple, nearly allways rough with
adhering sand-grains; pseudostome narrow, elliptic, notched in lateral view,
frontal view of pseudostome more or less convex or truncated, with rounded corners;
(Cash, The British Freshwater Rhizopoda and Heliozoa vol. II, 1909).
Species [ var. petricola ]: Test variable in shape, 80-100 μm long; lateral margins straight or slightly convex; pseudostome linear or elliptic.
[ var. major ]: Test colorless or lightish grey, 120-125 μm long; lateral margins nearly straight; pseudostome slightly less covex, but narrowed; (Cash, The British Freshwater Rhizopoda and Heliozoa vol. II, 1909).
Images of collecting locality:
No.3, Chigo-ike marsh (or Yakebitai marsh) at the top of Yakebitai mountain, Shiga highland (Oku-shiga highland), Yamanouchi town, Nagano Pref., Japan, July 20, 2008 by Y. Tsukii