Family: Scales cylindroid, thick, adjacent or overlapped, test usually with aperture bent to one side.
Genus: Test round in cross-section; scales usually adjacent; aperture truncate (Illustrated Guide, 1985).

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Cyphoderia sp. 115 x 66 μm Oyachi marsh Iizuna Highland Nagano, 2006	C. ampulla 150 x 62 μm Numa-no-hara m. Madarao highland Niigata, 2005	C. ampulla 150 x 60 μm Koigakubo marsh Tessei-cho Okayama, 2004	C. ampulla 150 x 57 μm Ohnuma enchi Nasu-shiobara Tochigi, 2006
C. ampulla 140 x 50 μm Oyomi marsh Hakuba Nagano, 2006	C. ampulla 130 x 65 μm Omotsubo m.3 Niimi Okayama, 2006	C. ampulla 130 x 56 μm Ikenokochi m.5 Tsuruga Fukui, 2006	C. ampulla 145 x 50 μm Nidanuma Tsuchiyu-onsen Fukushima, 2005
C. ampulla 110 x 49 μm Nidanuma Tsuchiyu-onsen Fukushima, 2005	C. ampulla 143 x 58 μm 140 x 55 μm Imou bog Toyohashi Aichi, 2004	C. ampulla 142 x 52 μm Japan, 1998	C. ampulla 140 x 54 μm Numappara marsh Kuroiso Tochigi, 2003
C. ampulla 140 x 48 μm Imori pond Myoko highland Niigata, 2004	C. ampulla 138 x 51 μm Numa-no-hara m. Madarao highland Niigata, 2005	C. ampulla 135 x 45 μm Mizubasho-en Mure Nagano, 2005	C. ampulla 130 x 48 μm Uruguay, 1999
C. ampulla 125 x 54 μm Uruguay, 1999	C. ampulla 125,145 x 51 μm Ichinose-enchi Norikura highland Nagano, 2005	C. ampulla 125 x 53 μm Maimeno-ike Norikura highland Nagano, 2006	C. ampulla 125 x 45 μm Furuike marsh Togakushi highland Nagano, 2005
C. ampulla 100 x 39 μm near Furuike Togakushi highland Nagano, 2006	C. ampulla 105 x 42 μm forest botanical g. Togakushi highland Nagano, 2006	C. ampulla 121 x 45 μm neck short Japan, 1999	C. ampulla 115 x 45 μm Lake Shirakaba Tateshina & Chino Nagano, 2005
C. ampulla 115 x 45 μm Yoshigadaira m. Shirane mountain Gunma, 2005	C. ampulla 110 x 43 μm Senjo-ga-hara Nikko Tochigi, 2003	C. ampulla 109 x 43 μm neck short Sukagawa Fukushima, 2001	C. ampulla 107 x 44 μm Onnenai Kushiro marsh Hokkaido, 2005
C. ampulla x 400 100 x 38 μm neck long Japan, 1998	C. ampulla ? 100 x 45 μm neck short Japan, 1998	C. ampulla ? 100 x 47 μm neck short Hanyu Saitama, 2003	C. ampulla 100 x 40 μm Taki-no-miya p. Fukaya Saitama, 2006
C. ampulla ? 112 x 39 μm Suiren-numas Hakkoda mountain Aomori, 2005	C. ampulla ? 120 x 46 μm Kannon-numa Shimogo Fukushima, 2005	C. ampulla ? 100 x 40 μm Oyachi marsh Iizuna Highland Nagano, 2006
C. compressa ? 115 x 38 μm Furuike marsh Togakushi highland Nagano, 2005	C. truncata 44 x 26 μm Japan, 1998

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