Genus: Test more or less flask-shaped, with more or less neck (Illustrated Guide, 1985).
Species: Test 80-160 μm long, 40-60 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. barbata 120 x 52 μm L/W=2.3 Ohnigo marsh Sukawa highland Akita, 2007	N. barbata 103 x 46 μm L/W=2.3 Oh-numa m7 Hachimantai Akita, 2007	N. barbata 112 x 43 μm L/W=2.3 Mida-ga-hara Gassan (mt) Yamagata, 2006	N. barbata 117 x 59 μm L/W= Numa-no-hara m Madarao highland Niigata, 2007
N. barbata 115 x 50 μm L/W=2.3 Chigo-ike 2 Shiga highland Nagano, 2006	N. barbata μm L/W= Yokotashiro 2 Oze marsh Gunma, 2007	N. barbata μm L/W= Yokotashiro 1 Oze marsh Gunma, 2007	N. barbata μm L/W= Yokotashiro 4 Oze marsh Gunma, 2008
N. barbata 115 x 42 μm L/W=2.7 Imou bog 1 Toyohashi Aichi, 2006	N. barbata ? μm L/W= Oh-numa m7 Hachimantai Akita, 2007	N. barbata ? 90 x 44 μm L/W= Iyari marsh 3 Omachi Nagano, 2007

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

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