Genus: Similar to Chlamydomonas, but
lacks chloroplasts; leucoplasts present instead; two equal-length flagella, usually with many starch granules;
pyrenoid absent; stigma present or absent; 2 or 4 contractile vacuoles anteriorly located;
asexual reproduction by zoospores; sexual reproduction iso- or anisogamous
(Illustrated Guide, 2000).
Species: Cell body nearlly spherical; 8-17 μm in diam.; papillae absent; 4 contractile vacuoles anteriorly located (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000). |
50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
Polytoma tetraolare Pascher,
stock Skit-1b, axenic culture with EM (from May 11 to May 14, 2005),
cell body 16-20 μm long, 10-13 μm wide, L/W=,
x 640, drainage ditch at Takao bridge, near Takao-sakura park, Kitamoto city, Saitama Pref., April 17, 2005 by Y. Tsukii
Polytoma tetraolare Pascher,
stock Skit-1b, axenic culture with EM (from May 14, 2005 to June 17, 2005),
cell body μm long, μm wide,
x 640, drainage ditch at Takao bridge, near Takao-sakura park, Kitamoto city, Saitama Pref., April 17, 2005 by Y. Tsukii
Polytoma tetraolare Pascher,
stock Skit-1a, axenic culture (February 4 to March 7, 2006),
a cyst (left) 14 μm in diam.,
cell body (right) 19 μm long, 10 μm wide, L/W=1.9,
flagella about 20 μm long,
x 400, x 640, Japan, 2006 by Y. Tsukii
