Family: Unicells or colonies of non-fixed number of cells; cell body variable in shape; one or more chloroplasts variable in shape; asexual reproduction by autospore or autocoenobium (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Colonies of 4, 8 or 16 cells; planktonic; body crescent in shape; tapered at both ends; cells attached to each other at dorsal surface; a chloroplast curved plate-like, with a pyrenoid (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
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| Cell relatively long & thin | Centrally thick & tapered at both ends | ||
| 26 samples | 21 samples | ||
S. gracile long & thin L/W= 1997-2005 |
S. gracile long & thin L/W= 1997-2005 |
S. bibraianum curvature strong L/W= 1998-2003 |
S. bibraianum curvature weak L/W= 1998-2003 |
| ??? | |||
Selenastrum sp.3 or Monoraphidium strongly curved cell 42 x 4 μm L/W=10.5 Ueno Tokyo, 2001 |
Selenastrum sp.1 cell 25 x 4 μm L/W=6.3 Urawa Saitama, 2001 |
Selenastrum sp.2 cell 35 x 3 μm Kosugi Toyama, 2002 |
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Selenastrum sp.4 or Dicloster cell 33 x 3 μm L/W=11 Nishinasuno Tochigi, 2001 |
Selenastrum sp.4 cell 25 x 2 μm L/W=12.5 near Town Hall Shobu Saitama, 2004 |
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Selenastrum sp.2 cell 24 x 2.5 μm L/W=9.6 Koriyama Fukushima, 2001 |
Selenastrum sp.2 cell 26 x 2.5 μm L/W=10.4 Mizumoto Park Tokyo, 2001 |
Selenastrum sp. ? cell 22 x 3 μm L/W=7.3 Tatebayashi Gunma, 2001 |
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Selenastrum sp. ? or Ankistrodesmus cell 40 x 2 μm L/W=20 Uruguay, 1999 |
Selenastrum sp. ? or Ankistrodesmus cell 25 x 1.5 μm L/W=16.7 Sue-machi Fukuoka, 2001 |
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