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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 136 μm long, 92 μm wide, L/W=1.5, pseudostome 48 μm wide, small pores present at the broadest point of the test, x 640, Tanohara Natural Park, Ontake highland, Otaki town, Nagano Pref., Japan, June 26, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Hyalosphenia papilio Hyalosphenia papilio Hyalosphenia papilio

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