Species: Mature cell body spherical or ellipsoidal, 12-15 μm in diam.; young cell body ellipsoidal or cylindrical, 8-13 μm long, 4-7 μm wide; rounded papilla present; chloroplast cup-shaped, with a large concave; stigma rounded, located anterior 1/4 of the cell body; nucleus centrally located (Süßwasserflora von Mitteleuropa 9, Chlorophyta I, 1983).

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Cell body spherical or nearly spherical
C. tenebraria ? cell 13 x 11 μm flag. μm papilla present Uruguay, 1999	C. tenebraria ? cell 12 μm φ flag. μm papilla present Uruguay, 1999 Movies	C. tenebraria ? stock 42-1, axenic cell 11-16 μm flag. μm papilla present Uruguay, 1999	C. tenebraria ? stock 42-1a, axenic cell 16 x 15 μm flag. μm conjugation Uruguay, 1999
C. tenebraria ? stock G1, axenic cell 11-16 μm φ flag. 15 μm papilla present Uruguay, 1999 ?	C. tenebraria ? cell 13-17 μm flag. μm papilla present Tokyo, 2001	C. tenebraria ? cell 15-19 μm flag. μm papilla present Japan, 1998	C. tenebraria ? cell 15 μm Kami-omino Kawashima or Kawajima Saitama, 2005

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