Family: Two long flagella, 1-2 chloroplasts and 1-2 contractile vacuoles present (Starmach, 1985).
Genus: Cell body naked, colorless (without chloroplasts), a contractile vacuole present, colony embedded in a gelatinous matrix of various shape (Starmach, 1985).

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S. intestinum cells pear-shaped 10 x 8 μm flag. 26-33 μm Uruguay, 1999	S. intestinum cells spherical 7 x 7 μm flag. 31 μm Saitama, 1999	S. intestinum cells sphe.-ellip. 9 x 7 μm flag. 42 μm Iruma Park Saitama, 2002	S. intestinum cells sphe.-ellip. μm flag. μm Chichibu Saitama, 2003
S. intestinum cells sphe.-ellip. μm flag. μm Shishizuka Oike Tsuchiura Ibaraki, 2003	S. intestinum cells sphe.-ellip. μm flag. μm Kiyasse-Hanyu Hanyu Saitama, 2003	S. intestinum cells sphe.-ellip. 8 x 7 μm flag. μm Onnenai Kushiro marsh Hokkaido, 2005	S. intestinum 18 x μm flag. 30 μm Kannon-numa Shimogo Fukushima, 2006
S. intestinum ? cells spherical 7-8 x 4-5 μm flag. μm Japan, 1998	S. intestinum ? cells spherical 8 x 5 μm flag. μm Japan, 2000
S. uvella μm Omine numa Tsukiyono Gunma, 2003	S. uvella μm Water reservoir Iiyama Nagano, 2008	Spongomonas sp. gel reddish 9 x 6 μm flag. 20 μm Uruguay, 1999	Spongomonas sp. μm flag. μm Naruto Chiba, 2003
Spongomonas sp. μm flag. μm Omine-numa Tsukiyono Gunma, 2003	Spongomonas sp. μm flag. μm Karakemi marsh Yasaka Nagano, 2005	Spongomonas sp. 7 μm flag. 30 μm Ushidome-ike Norikura highland Nagano, 2005	Spongomonas sp. 5-7 μm Kannon-numa Shimogo Fukushima, 2005
Spongomonas sp. 7 μm Karakemi marsh Omachi Nagano, 2006

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