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Chlorophyta: Chlorophyceae: Chlamydomonadales (Volvocales): Chlamydomonadaceae

Haematococcus lacustris
(Girod) Rostafiniski, 1871
Syn: H. pluvialis Flotow, 1844

Genus: Unicellular, within a large spherical sheath; two equal-length flagella emerging from anterior end; cell body spherical or ellipsoidal, connected with gelatinous sheath by fine filaments; a single chloroplast cup-shaped, with several pyrenoids (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).

Haematococcus lacustris, tape No. 0044, time code 0000, cell body 18 μm long, 14 μm wide, flagella 29 μm long, test 27 μm long, 23 μm wide, 2 equal-length flagella, a large chlroplast, anterior papilla, Japan, September 5, 1999, courtesy of N. Kinoshita, by Y. Tsukii

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