Lobosea:
Testacealobosia:
Arcellinida: Difflugina (formerly Arcellina): Hyalospheniidae
Hyalosphenia cuneata
Stein
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).
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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
50 μm
100 μm
150 μm; x 400
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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