Family: Pseudostome terminal; plate rectangular, siliceous or calcareous (Illustrated Guide, 1985).
Genus: Test flask-shaped (Illustrated Guide, 1985).

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Lateral side nearly straight
Q. symmetrica 85 x 42 μm Kami-Kenashitai 3 Hakkoda mountain Aomori, 2006	Q. symmetrica 80 x 45 μm Iroha-numa 2 Zao mountain Yamagata, 2006	Q. symmetrica 66 x 45 μm Kannon-numa Shimogo Fukushima, 2005	Q. symmetrica 79 x 42 μm Nidanuma Tsuchiyu-onsen Fukushima, 2005
Q. symmetrica 78 x 42 μm Komado marsh Showa - Tajima Fukushima, 2004	Q. symmetrica 76 x 38 μm Komado marsh Showa - Tajima Fukushima, 2004	Q. symmetrica 74 x 40 μm Komado marsh 2 Showa - Tajima Fukushima, 2007	Q. symmetrica μm Miyatoko m.5 Minami-Aizu Fukushima, 2008
Q. symmetrica ? 85 x 40 μm Hakama marsh Madarao highland Niigata, 2005	Q. symmetrica 78, 89 x 38 μm Imori pond Myoko highland Niigata, 2004	Q. symmetrica 70 x 37 μm Numa-no-hara m. Madarao highland Niigata, 2005	Q. symmetrica 72 x 43 μm Watasuge marsh Tsugaike highland Nagano, 2005
Q. symmetrica 84 x 40 μm Shimo-no-koike Shiga highland Nagano, 2005	Q. symmetrica μm Tanohara marsh 1 Shiga highland Nagano, 2007	Q. symmetrica 83 x 42 μm Tanohara marsh 4 Shiga highland Nagano, 2007	Q. symmetrica μm Yokotashiro 1 Katashina Gunma, 2007
Q. symmetrica 84 x 32 μm Mumei marsh Shiga highland Nagano, 2006	Q. symmetrica 65 x 31 μm Furuike marsh Togakushi highland Nagano, 2005	Q. symmetrica μm Azami-ike Norikura highland Nagano, 2007	Q. symmetrica 83 x 28 μm Japan, 1998
Q. symmetrica μm Kareki-numa Nikko Tochigi, 2008	Q. symmetrica μm Maeyama marsh Shiga highland Nagano, 2008
Test flask-shaped
Q. symmetrica 91 x 46 μm Ikenokochi m.4 Tsuruga Fukui, 2006	Q. symmetrica 100 x 42 μm Shibayachi m.5 Odate Akita, 2007	Quadrulella sp. Q. symmetrica ? 90 x 45 μm Omine-numa Tsukiyono Gunma, 2003	Q. symmetrica μm Iyari marsh 1 Omachi Nagano, 2008
Q. symmetrica 96 x 44 μm Kodanuki marsh Fujinomiya Shizuoka, 2006	Q. symmetrica μm Kashibaru marsh 1 Karatsu Saga, 2006
Large variety or ??
Q. symmetrica large var. ? 150 x 90 μm Ichinose-enchi Norikura highland Nagano, 2005	Q. symmetrica large var. ? 150 x μm Kareki-numa m. Nikko Tochigi, 2008	Quadrulella sp. or Lamtoquadrula sp. ? 113 x 58 μm Imou bog Toyohashi Aichi, 2004	Q. symmetrica ? 112 x 60 μm Koigakubo marsh Tessei-cho Okayama, 2004

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