Lobosea:
Testacealobosia:
Arcellinida: Lesquereusiidae (formerly Paraquadrulidae)
Quadrulella symmetrica
Wallich 1863
Quadrula symmetrica Wallich (Kudo 1966)
Quadrula symmetrica (Wallich) F. E. Schulze (Cash 1909)
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).
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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
50 μm
100 μm
150 μm; x 400
test 89 μm long, 38 μm wide, pseudostome 20 μm, x 640
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).
Please click on images for viewing enlarged.
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