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Lobosea: Testacealobosia: Arcellinida: Difflugiidae

 Difflugia mammilaris
Penard, 1893

Difflugia mammilaris Genus: Pseudostome lacks lobed collar; test round or oval in cross-section; pseudostome relatively large, with or lacking a collar (Illustrated Guide, 1985).
Species: Size, 90-130 μm long; 30-45 μm wide; Test, long-oval, with nipple-like extention at base; clear chitinoid, imbedded siliceous particles; pseudostome, oval, 20-30 by 15-20 μm (Illustrated Guide, 1985).

Difflugia sp. (mammilaris small variety ?), test 39 μm long, 24 μm wide, L/W=1.6, pseudostome 7 μm wide, x 640, Southern lakeside of Lake Shirakaba, Tateshina town & Chino city, Nagano Pref., Japan, May 21, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
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