Genus: Planktonic; colony of 2-8 cells surrounded by cell wall of their mother cell, but sometimes unicellular; cell body broad ellipsoidal, both ends slightly pointed and with a thick cell wall; 1-3 chloroplasts parietal plate-like, with a single pyrenoid (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Species: Cell body elongated ellipsoidal, (16-)18-24 μm long, 5.5-7(-10) μm wide; both ends rounded without cellwall thickening; cellwall thin; chloroplasts 2, 4 or 8 in number, parietal, disc-shaped, each with a single pyrenoid (Photomicrographs of the Freshwater Algae, vol. 6, 1987).

O. ecballocystiformis 13 x 8 μm Kuroiso Tochigi, 2001	O. ecballocystiformis μm Kuroiso Tochigi, 2002	O. ecballocystiformis 13 x 6 μm Otto-Numa Tsuchiura Ibaraki, 2002	O. ecballocystiformis μm Sansui-tei Tsukuba Ibaraki, 2002
O. ecballocystiformis 11-16 x 5-9 μm Near Toda Park Toda Saitama, 2002	O. ecballocystiformis 23 μm Seseragi Park Musashi-Urawa Saitama, 2002	O. ecballocystiformis? 8-11 x 4-6 μm Tsukuba Capio Ibaraki, 2002	O. ecballocystiformis? 9-15 x 6-8 μm Azuma river Tokorozawa Saitama, 2004
O. ecballocystiformis μm Sendabori Matsudo Chiba, 2002	O. ecballocystiformis 14 x 7 μm Ushidome-ike Norikura highland Nagano, 2005	O. ecballocystiformis 13 x 5 μm Ushidome-ike Norikura highland Nagano, 2006

Similar genus -->> Nephrocytium;

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