Genus: Pseudostome lacks lobed collar; test round or oval in cross-section; pseudostome relatively large, with or lacking a collar (Illustrated Guide, 1985). Species: Size, 200-400 μm long, 55-100 μm diam; test, cylindroid, narrowed toward pseudostome, tapered at base to spine-like tip; round cross-section; clear; imbedded quartz particles. Pseudostome truncate, round 40-90 μm, no neck, no collar (Illustrated Guide, 1985).

50 μm 100 μm 150 μm; x 400