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 ?,
test estimated 160 μm long, 80 μm wide, L/W=2.0,
pseudostome 19 μm wide, P/W=,
x 640, Nidanuma (Nitanuma), Tsuchiyu-onsen, Fukushima city, Fukushima Pref., Japan, October 28, 2005 by Y. Tsukii
31 μm
63 μm
94 μm; x 640