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Lobosea: Testacealobosia: Arcellinida: Difflugiidae

 Difflugia pyriformis
Ehrenberg, 1838

Difflugia pyriformis Genus: Pseudostome lacks lobed collar; test round or oval in cross-section; pseudostome relatively large, with or lacking a collar (Illustrated Guide, 1985).
Species: 45-50 μm long for small varieties, 100-600 μm long for large varieties; 25-30 μm wide (test diam.), small; 70-350 μm wide, large; test flask-shaped, base round or polygonal, narrow tapered neck; chitinoid, large imbedded quartz grains; Symbiont, green alga (Kudo, 1966).
Similar species -->> D. oblonga

Difflugia pyriformis small variety, test 88 μm long, 42 μm wide (test diam.), L/W=2.1, pseudostome 16 μm diam., P/W=0.38, x 400, Japan, 199? by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400

Cell division (?)

Difflugia pyriformis, x 400, x 640, by Y. Tsukii

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