Genus: Test more or less flask-shaped, with more or less neck (Illustrated Guide, 1985).
Species: Test 70-75 μm long (Cash, British Freshwater Rhizopoda and Heliozoa II, 1909).

->> Description at WPRNO

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N. tenella ? or N. griseola ? 108 x 80 μm L/W=1.4 Uba-ga-daira Nasu Tochigi, 2006	N. tenella ? or N. griseola ? 93 x 65 μm L/W=1.4 Iroha-numa 2 Zao mountain Yamagata, 2006	N. tenella ? 102 x 70 μm Chigo-ike 4 Shiga highland Nagano, 2006	N. tenella ? 86,100 x 78,80 μm Iyari marsh 3 Omachi Nagano, 2007
N. tenella ? μm L/W= Kareki-numa Nikko Tochigi, 2008

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