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).
Group: Carinatoides: Test with a lateral ridge.

->> Description at WPRNO

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N. carinata: Latarel border expanded into a keel
N. carinata 185, 195 μm L/W=1.6,1.8 East of Tojuro Azuma Mt. Yamagata, 2007	N. carinata 170,220 μm L/W=1.6 Yahei-daira m.3 Azuma Mt. Yamagata, 2007	N. carinata 160,205,214 μm L/W=1.5 Yahei-daira m.4 Azuma Mt. Yamagata, 2007	N. carinata ? 200 x 125 μm L/W=1.6 Yahei-daira m.4 Azuma Mt. Yamagata, 2007
N. carinata μm L/W= Yokotashiro 4 Katashina Gunma, 2007	N. carinata μm L/W= Yokotashiro 1 Katashina Gunma, 2007	N. carinata μm L/W= Yokotashiro 3 Katashina Gunma, 2008	N. carinata μm L/W= Yokotashiro 4 Katashina Gunma, 2008
N. carinata ? 172-240 x μm L/W= Tanohara marsh Shiga highland Nagano, 2006	N. carinata ? 180-284 x μm L/W= Shijuhachi-ike Shiga highland Nagano, 2006	N. carinata μm L/W= near Chigo-ike Shiga highland Nagano, 2008	N. carinata μm L/W= Chigo-ike 3 Shiga highland Nagano, 2008
N. carinata 117 x 90 μm L/W=1.3 Tenbo marsh Tsugaike highland Nagano, 2005
N. marginata: Keel less prominent than that of N. carinata; the margins of the test below the keel straight or concave
N. marginata ? 215 x 125 μm L/W=1.7 Kenashitai Hakkoda mountain Aomori, 2005	N. marginata ? 210-220 x μm L/W=1.8-2.1 Kami-Kenashitai 3 Hakkoda mountain Aomori, 2006
N. marginata ? or N. carinata ? 198, 220 x μm L/W=1.4 Sensho-ga-hara 12 Shizukuishi Iwate, 2007	N. marginata ? or N. carinata ? 220 x 130 μm L/W=1.7 Sensho-ga-hara 11 Shizukuishi Iwate, 2007	N. marginata ? or N. carinata ? 200 x 125 μm L/W=1.6 Sensho-ga-hara 10 Shizukuishi Iwate, 2007	N. marginata ? 175 x 105 μm L/W=1.7 near Hachimantai mt. Hachimantai Iwate, 2007
N. marginata 125 x 42 μm L/W= Tanohara marsh Shiga highland Nagano, 2007	N. marginata ? 295 x 192 μm L/W=1.5 Ukishima marsh Tsugaike highland Nagano, 2006	N. marginata ? or N. carinata ? 190 x 130 μm L/W=1.5 Ushidome-ike Norikura highland Nagano, 2005
Test consisting of a mixture of rectangular and oval plates
N. marginata ? μm L/W= Shibakusadaira Zao mountain Miyagi, 2007	N. marginata μm L/W= Yahei-daira m.3 Yonezawa Yamagata, 2007	N. marginata ? or N. carinata ? 188 x 130 μm L/W=1.4 Komado marsh Showa/Tajima Fukushima, 2007	N. marginata ? 235 x 150 μm L/W=1.6 Hikage marsh Shiga highland Nagano, 2005
N. marginata ? 215 x 125 μm L/W=1.7 Tanohara marsh Shiga highland Nagano, 2005	N. marginata ? 178 x 128 μm L/W=1.4 Shijuhachi-ike Shiga highland Nagano, 2005
Test consisting of circular or oval plates
N. carinata ? 170 x 115 μm L/W=1.5 Yahei-daira m.2 Azuma Mt. Yamagata, 2007	N. marginata ? 170 x 106 μm L/W=1.6 Mida-ga-hara 8 Gassan Yamagata, 2006	N. marginata ? 170 x 115 μm L/W=1.5 Mida-ga-hara 9 Gassan Yamagata, 2006	N. marginata ? 188 x 127 μm 185 x 118 μm L/W=1.5, 1.7 Komado marsh Showa/Tajima Fukushima, 2004
N. marginata ? 161 x 101 μm L/W=1.6 Midagahara 6 Tate-yama Toyama, 2006	N. marginata ? 186 x 118 μm L/W=1.6 Shimizu-daira Nasu Tochigi, 2005	N. marginata ? or N. carinata ? 130 x 80 μm L/W=1.6 Hakama marsh Madarao highland Niigata, 2005

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