Genus: Test more or less flask-shaped, with more or less neck (Illustrated Guide, 1985).
Group: Collaroides: Test ovate or elongate.
Species: Test 130 μm long, 86-90 μm wide (Cash, British Freshwater Rhizopoda and Heliozoa II, 1909).

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Test consisting of round or oval plates
N. collaris μm L/W= Naganuma Hachimantai Akita, 2007	N. collaris μm L/W= Oh-numa m.7 Hachimantai Akita, 2007	N. collaris 230 μm L/W=1.7 Ohnigo marsh Sukawa highland Akita, 2007	N. collaris 175-190 μm L/W=2.1 Ohnigo marsh Sukawa highland Akita, 2007
N. collaris ? 220 x 120 μm L/W=1.8 Nagori-ga-hara Sukawa highland Iwate, 2007	N. collaris 240 x 150 μm L/W=1.6 near Iroha-numa Zao mountain Yamagata, 2006	N. collaris 260 x 130 μm L/W=2.0 Numa-no-hara m. Madarao highland Niigata, 2005	N. collaris ? 225 x 90? μm L/W=2.5 Numa-no-hara m. Madarao highland Niigata, 2005
N. collaris 200,240 x μm L/W=1.8 Nidanuma Tsuchiyu-onsen Fukushima, 2005	N. collaris 132 x 67 μm L/W=2.0 Akebono marsh Tsuchiyu-onsen Fukushima, 2005
N. collaris 288 x 144 μm 198 x 119 μm 155 x 86 μm Numappara marsh Kuroiso Tochigi, 2003	N. collaris or N. militaris ? 150 x 90 μm L/W=1.7 Shimizu-daira Nasu Tochigi, 2005	N. collaris 140 x 78 μm L/W=1.8 Kariba-numa Nasu-shiobara Tochigi, 2006	N. collaris μm L/W= near Omine mt. Minakami Gunma, 2007
N. collaris μm L/W= Ko-numa Minakami Gunma, 2008	N. collaris 245, 180 μm L/W=1.8 Mumei marsh Shiga highland Nagano, 2006	N. collaris 250 x 155 μm L/W=1.6 Shijuhachi-ike Shiga highland Nagano, 2008
N. collaris 109 x 69 μm L/W= Iyari marsh 3 Omachi Nagano, 2007	N. collaris 174 x 82 μm L/W= Iyari marsh 1 Omachi Nagano, 2007	N. collaris μm L/W= Iyari marsh 1 Omachi Nagano, 2008
N. collaris 171 x 90 μm L/W=1.9 Ushidome-ike Norikura highland Nagano, 2005	N. collaris 160 x 82 μm 170 x 88 μm L/W=2.0,1.9 Ichinose-enchi Norikura highland Nagano, 2005	N. collaris 220 x 140 μm L/W=1.6 Midoriga-ike Togakushi highland Nagano, 2006
N. collaris 190 x 90 μm 280 x 140 μm L/W= Imou bog Toyohashi Aichi, 2004	N. collaris 157 x 87 μm L/W=1.8 Imou bog Toyohashi Aichi, 2006.4	N. collaris 210 x 125 μm L/W= Imou bog 7 Toyohashi Aichi, 2006.9
Test consisting of linear or rectangular plates (or mixture of rectangular and oval plates)
N. collaris 180 x 106 μm L/W=1.7 Kuroyachi marsh Hachimantai Iwate, 2007	N. collaris ? 160 x 102 μm L/W=1.6 Mida-ga-hara 9 Gassan (mt) Yamagata, 2006	N. collaris μm L/W= Miyatoko marsh Minami-Aizu Fukushima, 2008
Plates irregular in shape
N. collaris 150 x 100 μm L/W=1.5 Tanohara marsh Shiga highland Nagano, 2007	N. collaris 132 x 92 μm L/W= Yamamuro m.1 Maibara Shiga, 2008

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