Genus: Pseudostome lacks lobed collar; test round or oval in cross-section;
with or lacking a collar (Illustrated Guide, 1985).
Species: 80-130 μm long; 60-105 μm diam.; test, like D. acuminata but shorter, broader; short neck constricted at pseudostome, flared as collar; hollow spine at base; yellow to brown; imbedded siliceous particles; pseudostome 45-55 μm (Illustrated Guide, 1985).
Difflugia elegans or Difflugia accuminata var. inflata Penard or D. curvicaulis Penard ?,
test 180 μm long (including spine, 30 μm), 92 μm wide, L/W=2.0 (1.6),
pseudostome 55 μm wide,
x 400, Tanohara marsh, Shiga highland, Yamanouchi town, Nagano Pref., Japan, June 19, 2005 by Y. Tsukii
50 μm 100 μm 150 μm; x 400 :