Family: Unicells; cell wall present; two flagella (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Cell body essentially similar to Chlamydomonas, but cellwall always apart from cell body; outline of cellwall ellipsoidal, ovoid, spherical, or cylindrical; cellwall thin or thick; papilla rare; protoplasm cylindrical, ovoid, elongated ellipsoidal, or spindle-shaped, in some species with tail-like structure; space between the cellwall and protoplasm sometimes filled with gelatinous matrix; two flagella emerging from protoplasm through tubular structure existing between the protoplasm and cellwall to outside of cellwall; chloroplast parietel, cup-shaped or H-form; pyrenoids present/absent; stigma also present/absent; nucleus centrally located or slightly anterior; contractile vacoules two, rarely four (Süßwasserflora von Mitteleuropa 9, Chlorophyta I, 1983).

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V. sphaerelloides 15-18 x 5.5-6.5 μm Ageo Saitama, 2003	V. sphaerelloides ? 22 x 14 μm Tsutsuji-ga-oka Tatebayashi Gunma, 2006
V. fluviatilis cell 15 x 9 μm Ueno Tokyo, 2001	V. fluviatilis cell 17 x 8 μm Okubo Ryoke Akigase park Saitama, 2005	V. fluviatilis cell 25 x 18 μm Ashikaga flower p. Ashikaga Tochigi, 2006
V. aulata or V. fluviatilis ? cell 14 x 10 μm Kawashima or Kawajima Saitama, 2002	V. aulata cell μm Shiraoka Saitama, 2003	V. aulata cell μm Matsubushi Saitama, 2003	V. aulata cell μm Kawanago Ishibashi Tochigi, 2004
V. aulata & stock Tisk-2e cell 18 x 16 μm Kamigo ni-ku Kaminokawa Tochigi, 2004	V. aulata cell 23-25 x μm cell 18 x 16 μm Kamigo ni-ku Kaminokawa Tochigi, 2006	V. aulata cell 26 x 23 μm Umenoki-furukori Higashi-Matsuyama Saitama, 2006	V. aulata cell 19-29 x μm Kami-omino Kawajima Saitama, 2006
V. aulata cell 21 x 17 μm Kijioka Castle Ruin Honjo Saitama, 2006	V. aulata ? cell 13-21 x 10-18 μm Shimo-muneoka Shiki Saitama, 2004	V. aulata ? cell 16 x 15 μm Kurome rivers Asaka Saitama, 2004	V. aulata ? cell 17 x 14 μm Hazama marsh Ashikaga Tochigi, 2006
V. ordinata ? or Chlamydomonas ? cell 20 x15 μm Matsubushi Saitama, 2003	V. velata ? or V. cylindrica ? μm Flower park Ashikaga Tochigi, 2003	V. velata ? or V. cylindrica ? μm Old Sugata river Mibu Tochigi, 2008

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