Species: Cell body elongated ellipsoidal, 17-25 μm long, 7.5-15 μm wide; papilla present, conical or broad conical; chloroplast cup-shaped, with posterior inner cavity; a pyrenoid centrally located; stigma longitudinally elongated, located at anterior half of the cell surface; nucleus anterior (Süßwasserflora von Mitteleuropa 9, Chlorophyta I, 1983).

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C. mutabilis 23 x 16 μm Kami-muneoka Shiki Saitama, 2004	C. mutabilis 18-26 μm Izumi-no-mori-koen Yamato Kanagawa, 2003	C. mutabilis 18-25 x 15-20 μm Ara river Kumagaya Saitama, 2004	C. mutabilis 22 μm Showa-machi g.p. Showa Saitama, 2003
C. mutabilis 21 x 18 μm Tama river Chofu Tokyo, 2004	C. mutabilis 24 x 19 μm Shimo-kawahara p. Sayama Saitama, 2005	C. mutabilis 25 x 18 μm Koyama River Honjo Saitama, 2006	C. mutabilis ? 21 x 17 μm Kamigo ni-ku Kaminokawa Tochigi, 2006
C. mutabilis ? 31 x 19 μm Okubo Ryoke Akigase park Saitama, 2005

Similar species -->> C. moewusii;
Similar genus -->> Chloromonas; Chlorococcum;

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