Genus: Cell body crescent in shape (long, curved, tapered at both ends); cross section rounded; cell wall smooth or with longitudinal lines, bands on the cell wall in some species; chloroplast laminae ridged and radially arranged, which makes cross section star-shaped; pyrenoids aligned or scattered (Illustrations of The Japanese Fresh-water Algae, 1977).
Species:

C. moniliferum stock Sak-1, axenic 2 clips Kurome river Asaka Saitama, 2000

C. moniliferum stock Sak-1, axenic 2 clips Kurome river Asaka Saitama, 2000

C. moniliferum stock Sak-1, axenic 3 clips Kurome river Asaka Saitama, 2000