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Chlorophyceae: Chlamydomonadales (Volvocales): Phacotaceae
Volvocida: Chlamydomonadina: Phacotidae

 Pteromonas cordiformis
Lemmermann, 1900

Pteromonas Genus: Unicellular; two equal-length flagella emerging from anterior end; cell body flat, broad ovoidal, lateral view spindle-shaped, within a gelatinous sheath quadrangular in shape; a single chloroplast plate-like, with 4-6 pyrenoids (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Species:

Pteromonas cordiformis ?, cell body 9 μm long, 6.5 μm wide, test 13 μm long, 9 μm wide, stigma at equator, a pyrenoid located at posterior half of the body, x 640, standing water, Shiken-zaike, Kamikawa town, Saitama Pref., Japan, December 11, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Pteromonas Pteromonas Pteromonas
Cell body 11 μm long, 9 μm wide, lorica 13 μm long, 12 μm wide, flagella 12 μm long,
Pteromonas Pteromonas

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