Genus: Elongate, with a broad rounded or truncate posterior end during locomotion; highly plastic; delicate pellicle shows a fine striation; a free flagellum, long and conspicuous, tapers toward free end; a second flagellum adheres to the pellicle; a contractile vacuole, anterior, close to the reservoir (Kudo, 1966).

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Large size: more than 100 μm
Peranema sp. cell 180 x μm Monster Peranema ! Numappara marsh Kuroiso Tochigi, 2003	Peranema sp. cell 152 x 21 μm Monster Peranema ! highly plastic !! Saitama, 2001	Peranema sp. cell μm Numa-no-hara m5 Madarao highland Niigata, 2007	Peranema sp. cell μm Kannon-numa 11 Shimogo Fukushima, 2008
Large size: 75 to 100 μm
Peranema sp.1 cell 100 x 20 μm flag. 100 μm Japan, 199? Movies	Peranema sp.1' cell 75 x μm flag. 100 μm Japan, 199?	Peranema sp.1 cell division Japan, 199?	P. trichophorum cell 90 x 20 μm Kannon-numa Shimogo Fukushima, 2008
Medium size: 50 to 75 μm
P. trichophorum cell 70 x μm flag. 43 μm Ushiku Ibaraki, 2002	P. trichophorum cell 65 x μm flag. 63 μm Japan, 199?	P. trichophorum cell 65 x μm flag. μm Omine-numa Tsukiyono Gunma, 2003	P. trichophorum cell 63 x μm flag. 66 μm Japan, 199?
P. trichophorum cell 66 x μm flag. 67 μm Japan, 199?	P. trichophorum flagella released cell 58 x μm flag. 53 μm Japan, 2001	P. trichophorum cell 50 x 8 μm flag. 50 μm Japan, 199? Movies	P. trichophorum cell 50 x μm flag. 50 μm Saitama, 2000
P. trichophorum cell 55 x μm flag. 70 μm azure-C staining Japan, 1998	P. trichophorum cell 58 x 14 μm flag. 53 μm Gyoda Saitama, 2001	P. trichophorum cell 58 x 15 μm flag. 55 μm Higashi-sano Hakuba Nagano, 2004	P. trichophorum cell 55 x 15 μm flag. 25 μm near Ayu river Fujioka Gunma, 2004
P. trichophorum cell 50 x μm cysts & excystment Saitama?, 1999 Movies	P. trichophorum cell 50 x μm feeding Saitama, 1999	P. trichophorum cell 44 x 11 μm flag. 45 μm Chiba, 2000	P. trichophorum cell 47 x 11 μm flag. 62 μm Aizu Recreation p. Aizuwakamatsu Fukushima, 2005
P. trichophorum cell 50 x 15 μm flag. 66 μm Onnenai Kushiro marsh Hokkaido, 2005	P. trichophorum cell 50 x 12 μm flag. 41 μm Kumakubo Nasu-shiobara Tochigi, 2005	P. trichophorum cell 58 x 10 μm flag. 55 μm Koyama River Honjo Saitama, 2006
Small size: less than 50 μm
P. trichophorum ? cell 46 x μm flag. 41 μm Fukushima, 1999	Peranema sp.2 cell 45 x 7 μm flag. 35 μm Oh-asoh Kumagaya Saitama, 2004	Peranema sp.2 cell 38 x μm flag. 56 μm Japan, 199?	Peranema sp. cell 32 x μm flag. 40 μm Daidarabotchi-ike Iizuna-kogen Nagano, 2003
Peranema sp. cell 31 x μm flag. 44 μm Japan, 1998 Movies	Peranema sp. cell 27 x 11 μm flag. 34 μm Asa-kawa Hachioji Tokyo, 2005	Peranema sp. cell 20 x 8 μm flag. 27 μm Kayoicho-ike Fukuoka, 2001	Peranema sp. cell 20 x 7 μm flag. 32 μm Ichinose-enchi Norikura highland Nagano, 2005
Peranema sp. cell 15 x μm flag. 16 μm Showa-machi g.p. Showa Saitama, 2003

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