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Lobosea: Testacealobosia: Arcellinida: Arcellidae

 Arcella mitrata
Leidy

Arcella Genus: Test variable, chitinoid; binucleate (Illustrated Guide, 1985).
Species: Test 100-145 μm high, 100-152 μm in diam. (Cash, The British Freshwater Rhizopoda and Heliozoa vol. I, 1905).

Arcella mitrata Leidy small variety ? (or A. jeanneli ?), test 70 μm in diam., 71 μm high, x 400, x 640, Uruguay, November 1999, photo by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Arcella Arcella Arcella
Test 77 μm in diam., 70 μm high, x 400, x 640
Arcella Arcella Arcella
Test 71 μm in diam., 60 μm high, x 400, x 640
Arcella Arcella Arcella

Arcella mitrata Leidy, 1879: Test: brown, areolar, subspherical; diam. 100 - 200 μm; oral face diam. 65-100 μm; buccal depth 18-32 μm; height 115-165 μm; pseudostome lobed, waby, 25-90 μm. Similar species: A. jeanneli. Ref. Leidy (1879); Deflandre (1928). (Illustrated Guide, 1985).

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