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Chlorophyta: Prasinophyceae: Chlorodendrales (Tetraselmidales)
Mastigophora: Phytomastigophorea: Prasinomonadida

Tetraselmis
F. Stein, 1878

Genus: Cell body ellipsoidal-ovoidal with cell wall; Four equal-length flagella arising from an anterior depression of the cell body; chloroplast cup-shaped with a pyrenoid at the bottom; a single stigma large; two contractile vacuoles at the base of flagella (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).
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Tetraselmis
T. cordiformis ?
15 x 11 μm
Hana-no-oka Koen
Saitama, 2002
Tetraselmis
T. cordiformis ?
14 x 8 μm
Wan-park-land
Kochi, 2002
Tetraselmis
T. cordiformis ?
μm
Maihara
Shiga, 2003
Tetraselmis cordiformis
T. cordiformis ?
μm
Flower park
Ashikaga
Tochigi, 2003
Tetraselmis cordiformis
T. cordiformis
μm
Old Sugata r.
Mibu
Tochigi, 2008
Tetraselmis
T. cordiformis ?
17 x 14 μm
Tachikawa
Tokyo, 2004
Tetraselmis cordiformis
T. cordiformis ?
17 x 14 μm
Shiroyama Park
Okegawa
Saitama, 2006
Tetraselmis cordiformis
T. cordiformis ?
14 x 12.5 μm
Nakai-numa park
Yoshikawa
Saitama, 2006
Tetraselmis cordiformis
T. cordiformis ?
14 x 12.5 μm
Yase Shinsu koen
Minakami
Gunma, 2006
Tetraselmis cordiformis
T. cordiformis
μm
Akebono-yama p.
Kashiwa
Chiba, 2008
Similar genus -->> Carteria;

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Tetraselmis
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