Genus: Striated sutural regions dorsal and to rear of cytoproct; body tapers to rear from 3 sides (Illustrated Guide, 1985).
Buccal structure is well-stained by azure C (Y. Tsukii, 2000).

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Cell body more than 150 μm long
D. bütschlii large var. ? 213 x 110 μm USA, 1999	D. bütschlii large var. ? 170 x 95 μm Shirakawa Fukushima, 1999	D. bütschlii large var. ? 168 x μm Kurobane Tochigi, 2003	D. bütschlii 150 x 80 μm Kurome river Asaka Saitama, 2005
D. bütschlii large var. ? 240 x 136 μm near Omine-numa Minakami Gunma, 2006
Cell body 100-150 μm long
D. bütschlii 150 x 87 μm 136 x 75 μm well fed cells Japan, 1998	D. bütschlii cysts 98 x 74 μm Japan, 1998	D. bütschlii 125 x 70 μm USA, 1999	D. bütschlii 145 x 87 μm Numa-no-hara m. Madarao highland Niigata, 2005
D. bütschlii cysts 103 x 86 μm USA, 1999	D. bütschlii 110 x 58 μm starved cells Japan, 1998	D. bütschlii 110 x 80 μm 2 Mic. Azure C staining Japan, 199?	D. bütschlii 101-122 μm conjugating pairs Japan, 1998
D. bütschlii Mac. 104 μm Japan, 1998	D. bütschlii ? and D. minor cell μm Japan, 1999
Cell body less than 100 μm long
D. minor? 100 x 63 μm Koma river Sakado Saitama, 2004	D. minor 69 x 40 μm Matsumoto Nagano, 2001	D. minor ? 100 x 60 μm posterior rounded USA, 1999 Movies	D. minor 88 x 55 μm 1 Mic. posterior pointed Saitama, 1999
D. minor 65 x 35 μm Shimizu-daira Nasu Tochigi, 2005	D. minor ? 97 x 80 μm 1 Mic. Azure C staining Japan, 1998	Disematostoma sp. 100 x 45 μm or Frontonia ? USA, 1999

Similar Genus ->> Frontonia

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