Genus: Colonies of 4 (or 2, 8, 16) cells attached side by side, arranged linearly or zigzag; cell body elliptical or spindle or crescent in shape; terminal cells with spiny projections in many species; cell wall usually smooth, but in some species granulated or dented or ridged (Illustrations of The Japanese Fresh-water Algae, 1977).
Species [ var. denticulatus ]: Colonies of 4-8 cells arranged in a slightly zigzag pattern or straight; cells at both ends have 2-3 dented projections at both termini, inner cells have such projections at only one terminus; cell body 10-15 μm long, 5-10 μm diam. (Illustrations of The Japanese Fresh-water Algae, 1977).
Google Image Search
| Cell body more than 10 μm | |||
var. denticulatus cell 20 x μm spines μm Higusa-numa Hikari Chiba, 2003 |
var. denticulatus cell 18 x 9 μm spines 3 μm Japan, 1997 |
var. denticulatus cell 16 x μm spines μm Showa-machi G.P. Showa Saitama, 2003 |
var. denticulatus cell 15 x 6 μm spines 2.3 μm Omiya Saitama, 2000 |
var. denticulatus cell 16 x 6 μm spines 4 μm Abiko Chiba, 2000 |
var. denticulatus cell 14 x 5-7 μm spines 2-3 μm Nishi-jo-numa Saitama, 2002 |
var. denticulatus cell 15-16 x 8 μm spines 3 μm Abiko Chiba, 2000 |
var. denticulatus cell 15 x 7 μm spines 4 μm Koshigaya Saitama, 2001 |
var. denticulatus cell 15 x 6 μm Obihiro-Hasshonochi Obihiro Hokkaido, 2005 |
var. denticulatus cell 14 x 6 μm spines 3.5 μm Dewa park Koshigaya Saitama, 2001 |
var. denticulatus cell 12 x μm spines μm Higusa-numa Hikari Chiba, 2003 |
var. denticulatus cell μm spines μm Sa-numa park Shimotsuma Ibaraki, 2001 |
var. denticulatus cell 17 x 9 μm Kejo-numa Osaki Miyagi, 2006  |
var. denticulatus cell 13 x 3 μm spines 3 μm Oh-asoh Kumagaya Saitama, 2004 |
var. denticulatus cell 17 x 7 μm spines 2 μm near Town Hall Shobu Saitama, 2004 |
var. denticulatus cell 12 x 6 μm spines μm Shirahata-Numa Urawa Saitama, 2005 |
var. denticulatus cell 13.5 x 9 μm spines μm suigo-koen Itakura Gunma, 2008 |
var. linearis ? cell 16 x 8 μm spines 2 μm Iruma river Kawagoe Saitama, 2004 |
var. denticulatus or var. fenestratus ? cell 11 x 6 μm spines 1.5 μm Mizumoto Park Tokyo, 2001 |
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| Cell body less than 10 μm | |||
var. fenestratus cell 7 x 4.5 μm spines 2 μm Saitama, 1999 |
var. fenestratus cell 8 x 4.5 μm spines 1 μm Tatebayashi Gunma, 2001 |
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