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: Cell body slightly curved, inner-side nearly straight; L/W= 6-8; cell wall smooth, transparent; chloroplasts with 5-10 laminae; 6-8 pyrenoids in each semi-cell; 200- (240-400) -540 μm long, 28- (30-52) -79 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).
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C. lanceolatum
568 x 120 μm
L/W=4.7
Ichinose-enchi
Norikura highland
Nagano, 2005
C. lanceolatum
248 x 40 μm
with bands
Uruguay, 1999
C. lanceolatum
230 x 43 μm
L/W=5.3
Oyachi marsh
Iizuna Highland
Nagano, 2005
C. lanceolatum
215-265 x 38-40 μm
L/W=
General Athletic p.
Utsunomiya
Tochigi, 2007
C. lanceolatum ?
160 x 40 μm
L/W=4.0
Tsuchiura
Ibaraki, 2003
C. lanceolatum ?
260 x 50 μm
L/W=5.2
Kami-takayanagi
Kisai town
Saitama, 2003
