Family: Unicells or colonies of non-fixed number of cells; cell body variable in shape; one or more chloroplasts variable in shape; asexual reproduction by autospore or autocoenobium (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Unicellular, planktonic; cell body large, spherical in shape; many chloroplasts disc- or lens-shaped, with a pyrenoid, parietal or radially arranged from the center (Guide book to the "Photomicrographs of the Freshwater Algae", 1998). 100-200 μm in diam. (Illustrations of The Japanese Fresh-water Algae, 1977).

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Cell body spherical
E. viridis 74 μm φ Kenashitai Hakkoda mountain Aomori, 2005	E. viridis 156-190 μm φ Tashirodaira m. Hakkoda mountain Aomori, 2005	E. viridis 157 μm φ Tashirodaira m.5 Hakkoda mountain Aomori, 2006	E. viridis μm φ near Hachimantai Mt. Hachimantai Iwate, 2007
E. viridis 98 μm φ Sukawa highland Kurikoma mt. Iwate, 2007	E. viridis 89 μm φ Sukawa highland-1 Kurikoma mountain Akita, 2005	E. viridis 88 μm φ Sukawa highland-2 Kurikoma mountain Akita, 2005	E. viridis 91 μm φ Mida-ga-hara Gassan Yamagata, 2005
E. viridis 230, 158 μm φ Numa-no-hara m. Madarao highland Niigata, 2005	E. viridis 100 μm φ Oze-shokubutu k.m. Katashina Gunma, 2006	E. viridis μm φ Ayamedaira Katashina Gunma, 2006
E. viridis 135-176 μm φ Numappara marsh Kuroiso Tochigi, 2003	E. viridis dividing cell 182 μm φ Numappara marsh Kuroiso Tochigi, 2003	E. viridis dividing cell μm φ Kareki-numa Nikko Tochigi, 2008
E. viridis 123 μm φ Kamino-tanbo Tsugaike highland Nagano, 2006	E. viridis 92 μm φ Tanohara marsh Shiga highland Nagano, 2004	E. viridis 70 μm φ Tanohara marsh Shiga highland Nagano, 2005	E. viridis 80 μm φ Tanohara marsh Shiga highland Nagano, 2006
E. viridis 43 μm φ Hikage marsh Shiga highland Nagano, 2005	E. viridis 45 μm φ Hikage marsh Shiga highland Nagano, 2006	E. viridis 45 μm φ Iyari marsh Omachi Nagano, 2006	E. viridis μm φ near Chigo-ike Shiga highland Nagano, 2008
E. viridis 166 μm φ Ichinose-enchi Norikura highland Nagano, 2005	E. viridis 225 μm φ Ichinose-enchi Norikura highland Nagano, 2006	E. viridis 43 μm φ Ushidome-ike Norikura highland Nagano, 2005	E. viridis 45 μm φ Ushidome-ike Norikura highland Nagano, 2006
E. viridis 157 μm φ Kodanuki marsh Fujinomiya Shizuoka, 2006	E. viridis ? 138 x 118 μm Imou bog Toyohashi Aichi, 2004
Cell body broadly ellipsoidal with rounded apices
E. gigas ? 57 x 46 μm φ Yukawa-numa Nishiwaga Iwate, 2007	E. gigas ? μm φ Ishinazaka Furukawa Miyagi, 2003	E. gigas ? μm φ Namegawa Saitama, 2003
Cell body ellipsoidal, apices concave
E. viridis ? 130 x 110 μm Ikenokochi marsh Tsuruga Fukui, 2004	E. viridis ? 116 x 100 μm Kabuto-yama Nishi-no-miya Hyogo, 2004	E. viridis ? 136 x 117 μm Senuki Nasu Tochigi, 2004	E. viridis ? 125 x 103 μm Naruto-Togane c.p.c. Sanmu Chiba, 2006
E. viridis ? μm near Bungo-Mori R.S. Kusu Oita, 2008
???
Eremosphaera sp. 70 x 57 μm near City Hall Fujimi Saitama, 2004	Eremosphaera sp. ? μm φ Riverside green l. Sawara Chiba, 2004	Eremosphaera sp. ? μm Ogose Saitama, 2003	Eremosphaera sp. ? stock Sog-2 27-46 x 21-44 μm Ogose Saitama, 2003

Similar genera -->> Botrydiopsis; Oocystis;

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