Genus: Test ovate; discoid in cross-section; pseudostome round, oval or elliptical (Illustrated Guide, 1985). Species: Test ovoid, without foreign bodies; 16-20 μm long, 12-15 μm wide (Kudo, 1966). 15-24 μm long, 10-18 μm wide; pseudostome oval, terminal; test smooth, clear, brownish, flask-shaped, circular in cross-section (Illustrated Guide, 1985).

50 μm 100 μm 150 μm; x 400 : 31 μm 62 μm 94 μm; x 640