Genus: Test circular, ovoid or discoid; pseudostome eccentric, circular or ovoidal;
with or without spines (Kudo, 1966).
Species:
Test 120-150 x 75-100 μm,
60-75 μm in hight,
pouch-shaped in oral view, round in lateral, tapered toward anterior;
pseudostome 25-30 μm with incurved lips;
several similar species (Illustrated Guide, 1985).
Centropyxis constricta (Ehrenberg) ?,
test 88 μm long, 75 μm wide, L/W=,
pseudostome 23 μm long, 47 μm wide, L/W=,
x 640, No.4, Chigo-ike (marsh pond) at the top of Yakebitai mountain, Shiga highland (Oku-shiga highland), Yamanouchi town, Nagano Pref., Japan, October 9, 2006 by Y. Tsukii
50 μm
100 μm
150 μm; x 400
Images of collecting locality:
No. 4, Chigo-ike marsh at the top of Yakebitai mountain, Shiga highland (Oku-shiga highland), Yamanouchi town, Nagano Pref., Japan, October 9, 2006 by Y. Tsukii