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Lobosea: Testacealobosia: Arcellinida: Difflugina (formerly Arcellina): Hyalospheniidae

 Hyalosphenia cuneata
Stein

Hyalosphenia Genus: Test ovate, discoid in cross-section; pseudostome a terminal slit (Illustrated Guide, 1985).
Species: Test 75 μm long, 60 μm wide (Cash, The British Freshwater Rhizopoda and Heliozoa vol. II, 1909).

Hyalosphenia cuneata Stein, test 62 μm long, 40 μm wide, L/W=1.6, pseudostome 12 μm wide, x 640, Kurome river, Asaka city, Saitama Pref., Japan, January 9, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Hyalosphenia cuneata Hyalosphenia cuneata Hyalosphenia cuneata

H. papilio Leidy, 1879: 100-140 μm long, 60-100 μm wide near base; pseudostome oval, 25-30 x 10-12μm; test flask-shaped, base bulbous, neck straight-sided (Illustrated Guide, 1985). Test clear, yellowish, several minute pores in the base; cross section, pseudostome, both biconvex; ameba dose not fill test; many epipodia (How to know the protozoa, 1979).

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