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

 Hyalosphenia papilio
Leidy

Hyalosphenia Genus: Test ovate, discoid in cross-section; pseudostome a terminal slit (Illustrated Guide, 1985).
Species: Test chitinous, transparent, yellowish; frontal view oblong-oval or pyriform, 110-140 μm long; a minute pore present on each side at the broadest point; lateral view elongate-pyriform; pseudostome forming a shallow notch; transverse section narrowly elliptic; (Cash, The British Freshwater Rhizopoda and Heliozoa vol. II, 1909).

Hyalosphenia papilio Leidy, test 128 μm long, 85 μm wide, L/W=, pseudostome 40 μm wide, x 640, No.1, Chigo-ike (marsh pond) at the top of Yakebitai mountain, Shiga highland (Oku-shiga highland), Yamanouchi town, Nagano Pref., Japan, October 9, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Hyalosphenia papilio
Test 144 μm long, 94 μm wide, L/W=, pseudostome 44 μm wide, x 640
Hyalosphenia papilio Hyalosphenia papilio Hyalosphenia papilio
Test 132 μm long, 90 μm wide, L/W=, pseudostome 45 μm wide, x 640
Hyalosphenia papilio Hyalosphenia papilio

Images of collecting locality: Chigo-ike (large marsh pond) at the top of Yakebitai mountain, Shiga highland (Oku-shiga highland), Yamanouchi town, Nagano Pref., Japan, October 9, 2006 by Y. Tsukii

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