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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 (Quadrula) symmetrica, test pyriform, 83 μm long, 28 μm (or more) wide, scale rectangular 8 x 6 μm, x 400, x 640, Japan, 1998 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400
Quadrulella Quadrulella Quadrulella Quadrulella

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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