Genus: Test more or less flask-shaped, with more or less neck (Illustrated Guide, 1985).
Species: Test 120-125 μm long, 65-70 μm wide; (Cash, British Freshwater Rhizopoda and Heliozoa II, 1909).

->> Description at WPRNO

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Group: Lagenoides: Test with a long neck
N. lageniformis 143,150 x μm L/W=1.9,2.1 Hakkoda Gourd line Hakkoda mountain Aomori, 2005	N. lageniformis 130 x 68 μm L/W=1.9 Kenashitai Hakkoda mountain Aomori, 2005	N. lageniformis 150 x 76 μm L/W= Shimo-Kenashitai 5 Hakkoda mountain Aomori, 2006	N. lageniformis μm L/W= Ohyachi 3 Hachimantai Akita, 2007

Similar species -->> N. americana; N. barbata;

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