Family: Test usually more or less compressed; pseudostome narrowly oval or slit-like.
Genus: (Illustrated Guide 2nd).

->> Description at WPRNO

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P. bigibbosa 230 x 145,150 μm L/W=1.5,1.6 Hakkoda Gourd line Hakkoda mountain Aomori, 2005	P. bigibbosa 230,260,280 μm L/W=1.7,2.0 Kenashitai Hakkoda mountain Aomori, 2005	P. bigibbosa 280 x 180 μm L/W=1.6 Kenashitai Hakkoda mountain Aomori, 2005	P. bigibbosa 260 x 170 μm L/W=1.5 Kenashitai Hakkoda mountain Aomori, 2005
P. bigibbosa 265 x 177 μm L/W=1.5 Oze-ga-hara Katashina Gunma, 2006	P. bigibbosa 250 x 160 μm L/W=1.6 Tanohara marsh Shiga highland Nagano, 2004	P. bigibbosa 266 x 154 μm L/W=1.7 Watasuge marsh Tsugaike highland Nagano, 2005	P. bigibbosa ? μm L/W= Fujimitashiro Katashina Gunma, 2007
Similar to Nebela marginata
Porosia sp. 250 x 160 μm L/W=1.6 Shimo-Kenashitai 5 Hakkoda mountain Aomori, 2006	Porosia sp. 283 x 195 μm L/W=1.5 Chigo-ike 4 Shiga highland Nagano, 2006

Similar species -->> Nebela;

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