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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 (or H. minuta Cash ?), test clear, 56 μm long, 36 μm wide, vesicular nucleus 11 μm diam., endosome μm diam., x 400 ??, Shirakawa, Fukushima Pref., Japan, October 1999, collected by H. Shiomizu, photo by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400
Hyalosphenia Hyalosphenia

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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