Genus: Test more or less flask-shaped, with more or less neck (Illustrated Guide, 1985).
Group: Lagenoides: Test with a long neck.
Species: Test 160-175 μm long, 65-75 μm wide; (Cash, British Freshwater Rhizopoda and Heliozoa II, 1909).

->> Description at WPRNO

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N. americana 166 x 63 μm L/W=2.6 Sukawa highland Ichinoseki Iwate, 2007	N. americana 160 x 65 μm L/W=2.5 Shirakaba-Yachi Komado marsh Fukushima, 2007	N. americana 153 x 68 μm L/W=2.3 Oh-Yachi Komado marsh Fukushima, 2007	N. americana μm L/W= Shibayachi m.5 Odate Akita, 2007
N. americana μm L/W= Shibayachi m.6 Odate Akita, 2007	N. americana ? μm L/W= Oh-numa m.7 Hachimantai Akita, 2007	N. americana 126 x 45 μm L/W=2.8 Nakayukawa r. Nishiwaga Iwate, 2007
N. americana 135 x 55 μm L/W=2.4 Numa-no-hara m. Madarao highland Niigata, 2005	N. americana 137 x 63 μm L/W=2.2 Furuike marsh Togakushi highland Nagano, 2005	N. americana or N. lageniformis ? 160 x 72 μm L/W=2.2 Obihiro-Hasshonochi Obihiro Hokkaido, 2005

Similar species -->> N. lageniformis; N. collaris; N. barbata;

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