Genus: Test ovate, discoid in cross-section; pseudostome a terminal slit
(Illustrated Guide, 1985).
Species: Test flask-shaped, 200 μm long, 90 μm wide
(Cash, The British Freshwater Rhizopoda and Heliozoa vol. II, 1909).
Hyalosphenia nobilis Cash,
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
50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640