Species: cell body medium in size, slightly shorter than its width, bay closed, 41-43 μm long, (35)-38 μm wide, isthmus (11.5)-14 μm wide; semicells pyramidal in shape with truncated apex, basal corners rounded, lateral margins slightly convex; cell wall covered with many granules arranging radially at periphery of the semicells, central region smooth (Illustrations of The Japanese Fresh-water Algae, 1977).

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C. vexatum ? two pyrenoids 56 x 49 μm Hinode bridge Tachikawa Tokyo, 2004	C. vexatum two pyrenoids 53 x 41 μm Kinu river Takanezawa Tochigi, 2004	C. vexatum ? two pyrenoids 52 x 46 μm Kejo-numa Furukawa Miyagi, 2003	C. vexatum ? two pyrenoids 52 x 42 μm Usui river Takasaki Gunma, 2004
C. vexatum ? two pyrenoids 51 x 42 μm Akanuma Hatoyama Saitama, 2004	C. vexatum ? two pyrenoids 51 x 43 μm Junichogata s.k. Himi Toyama, 2006
C. vexatum ? two pyrenoids 49 x 38 μm Karasu river Takasaki Gunma, 2004	C. vexatum two pyrenoids 46 x 39 μm L/W=1.2 Japan, 1998	C. vexatum two pyrenoids 45 x 35 μm L/W=1.3 Chichibu Saitama, 2003	C. vexatum two pyrenoids 43 x 37 μm L/W=1.2 Aquatic botanical g. Sawara Chiba, 2004
C. vexatum two pyrenoids 43 x 35 μm Ishinazaka Furukawa Miyagi, 2003	C. vexatum two pyrenoids 41 x 35 μm L/W= Muneoka Shiki Saitama, 2004	C. vexatum two pyrenoids 42 x 34 μm L/W=1.2 near Takao bridge Kitamoto Saitama, 2005	C. vexatum or C. sportella ? 43 x 38 μm L/W=1.1 Muneoka Shiki Saitama, 2004
C. vexatum two pyrenoids 42 x 37 μm Junichogata Himi Toyama, 2006	C. vexatum two pyrenoids 35 x 28 μm Shuku Sakura-ku Saitama, 2004
C. vexatum ? single pyrenoids 36 x 29 μm 33 x 30 μm L/W=1.1, 1.2 riverside park Kuroiso Tochigi, 2005	C. vexatum ? single pyrenoids ? 31 x 28 μm L/W=1.1 Kawashima or Kawajima Saitama, 2002	C. vexatum single pyrenoid 33 x 23 μm L/W=1.4 Midorigaoka park Sukagawa Fukushima, 2003	C. vexatum single pyrenoid 34 x 25 μm L/W=1.4 Midorigaoka park Sukagawa Fukushima, 2003
C. vexatum single pyrenoid 29 x 24 μm 31 x 24 μm L/W=1.2, 1.3 Tone river Tsukiyono Gunma, 2003	C. vexatum single pyrenoid 30 x 24 μm L/W= near Oyomi m. Hakuba Nagano, 2008

Similar species -- >> C. sportella var. subnudum;

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