Family:
Genus: Unicellular; planktonic; cell body flat, ovoidal; two flagella emerging from anterior end, one extends anteriorly and another posteriorly; a reservoir and a contractile vacuole present, trichocysts absent; many chloroplasts ellipsoidal in shape, light green in color (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).

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V. virescens μm Kejo-numa Furukawa Miyagi, 2003
V. virescens 38 x 34 μm near Akai wetland Aizuwakamatsu Fukushima, 2005	V. virescens ? 42-53 x 33-45 μm Jodo-daira Azuma mountain Fukushima, 2006	V. virescens ? 51 x 43 μm Jodo-daira Azuma mountain Fukushima, 2006	Vacuolaria sp. 43 x 31 μm Kannon-numa Shimogo Fukushima, 2005
V. virescens ? 51 x 43 μm Nakatashiro Oze-ga-hara Gunma, 2006	V. virescens 36 x 31 μm Watarase Wetland Fujioka Tochigi, 2005	V. virescens 32 x 29 μm Tsuchiura Ibaraki, 2002	V. virescens 45 x 25 μm Tsuchiura Ibaraki, 2002
V. virescens 46 x 42 μm Kawaguchi Natural p. Kawaguchi Saitama, 2005	V. virescens μm Kannon-numa Shimogo Fukushima, 2008
V. virescens 55 x 46 μm Tane-ike Togakushi highland Nagano, 2005	V. virescens 48 x 29 μm Tane-ike Togakushi highland Nagano, 2006	V. virescens 46 x 35 μm Karakemi marsh Omachi Nagano, 2006	V. virescens 75 x 70 μm Iyari marsh 1 Omachi Nagano, 2007
V. virescens μm Iyari marsh 4 Omachi Nagano, 2008	V. virescens ? 49 x 44 μm Dojo-ike Norikura highland Nagano, 2006	V. virescens ? 62 x 45 μm Kashibaru marsh 5 Karatsu Saga, 2006	V. virescens ? μm Omine-numa 5 Minakami Gunma, 2007
V. virescens μm Kannon-numa Shimogo Fukushima, 2008

Similar genus ->> Gonyostomum;

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