Genus: Highly flattened; pellicle firm; body form constant (Kudo, 1966). Chloroplasts small, discoid, pyrenoids usually absent; most species flat and leaf-shaped; often with ridges or fins running helically or longitudinally (Illustrated Guide, 1985).
Species: Cell body 37-68 μm long, 25-45 μm wide, dorsally broad ovoidal, cauda relatively long and curved, striae straight, a longitudinal prominent ridge at the center which makes frontal view triangular; a locomotive flagellum nearly the same as the cell body in length; paramylon bodies large disc-shaped, 1-2 in number (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).

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P. triqueter 80 x 50 μm Uruguay, 1999	P. triqueter 80 x 48 μm Omachi natural p. Chiba, 2001	P. triqueter 80 x 55 μm Uruguay, 1999	P. triqueter 80 x 48 μm Nanbata castle p. Fujimi Saitama, 2005
P. triqueter 75 x 45 μm Izumo Shrine Izumo Shimane, 2006	P. triqueter 74 x 45 μm Uruguay, 1999	P. triqueter ? μm Michi-no-eki Tsukiyono Gunma, 2003	P. triqueter 70 x 47 μm near Town Hall Shobu Saitama, 2004
P. triqueter 65 x 40 μm Fujimi Saitama, 2003	P. triqueter 60 x μm Iruma Saitama, 2003	P. triqueter 57 x 40 μm Mizuko-kaizuka p. Fujimi Saitama, 2003	P. triqueter 56 x μm chl. 2-3 μm Kodama Saitama, 2003
P. triqueter 55 x 40 μm Mizuko-kaizuka p. Fujimi Saitama, 2004	P. triqueter 48 x 36 μm Ichikawa Chiba, 2001	P. triqueter 47 x 35 μm Aizu Recreation p. Aizuwakamatsu Fukushima, 2005	P. triqueter 44 x 37 μm Higashi-Urawa Saitama, 2001
P. triqueter μm near Nan-ko Shirakawa Fukushima, 2003	P. triqueter ? 43 x 30.5 μm Mihashi Park Saitama, 2002	P. triqueter ? 40 x 22 μm Watarase Wetland Fujioka Tochigi, 2005	P. triqueter ? 40 x 30 μm Kareki-numa Nikko Tochigi, 2008
P. triqueter 35 x μm Shimotsuma Ibaraki, 2003

Similar species -- >> P. pleuronectes;

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