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Lobosea: Testacealobosia: Arcellinida: Lesquereusiidae (formerly Paraquadrulidae)

 Quadrulella symmetrica
Wallich 1863
Quadrula symmetrica Wallich (Kudo 1966)
Quadrula symmetrica (Wallich) F. E. Schulze (Cash 1909)

Quadrulella Genus: Test flask-shaped (Illustrated Guide, 1985).
Species: Test variable in size, about 96 μm long, 60-70 μm wide, 40 μm in thickness; frontal view pyriform, pseudostome slightly convex, dorsoventrally compressed; transparent chitinous plates arranged in series across the surface (Cash, The British Freshwater Rhizopoda and Heliozoa vol. II, 1909).

Quadrulella symmetrica Wallich, test 78 μm long, 38 μm wide, pseudostome 20 μm, x 640, Imori pond, Myoko-kogen (Myoko highland), Myoko village, Niigata Pref., Japan, November 7, 2004 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400
Quadrulella symmetrica Quadrulella symmetrica Quadrulella symmetrica
test 89 μm long, 38 μm wide, pseudostome 20 μm, x 640
Quadrulella symmetrica Quadrulella symmetrica

Q. symmetrica (Wallich, 1863): 90-110 μm long, 60-70 μm wide, 35-40 μm deep; test pyriform, siliceous, rectangular plates in rows; oval in cross-section; pseudopods, cylindroid (Illustrated Guide, 1985).

Quadrula symmetrica Wallich: Test pyriform, with quadrangular siliceous or calcareous paltelets (not overlapping); 80-140 μm long, 40-96 μm wide (Kudo, 1966).

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