Family: Test usually more or less compressed; pseudostome narrowly oval or slit-like.
Genus: Test more or less flask-shaped, with more or less neck (Illustrated Guide, 1985).

->> Description at WPRNO

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Group: Collaroides: Test ovate or elongate
N. dentistoma v. lævis ? 108-116 x μm L/W=1.2-1.4 Hakkoda Gourd line Hakkoda mountain Aomori, 2005	N. dentistoma v. lævis ? 133 x 108 μm L/W=1.2 Midagahara 3 Tate-yama Toyama, 2006	N. dentistoma 92 x 58 μm L/W=1.6 Tanohara marsh Shiga highland Nagano, 2004	N. dentistoma 90 x 75 μm L/W=1.2 Nidanuma Tsuchiyu-onsen Fukushima, 2005
N. dentistoma ? μm L/W= Japan, 199? by H. Yoshino

Similar species -->> Porosia;

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