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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 60 μm long, 44 μm wide, nucleus 11 μm in diam., two endosomes 3 μm in diam., x 640, Watarase river, Ashikaga city, Tochigi Pref., Japan, February 1, 2004 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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