Genus: Cigar- or foot-shaped; a single macronucleus and 1 to several vesicular or compact microuclei (Kudo, 1966).
Species: 100-150 μm long, 50-60 μm wide; foot-shaped; green with symbiontic Chlorella; a compact micronucleus; a macronucleus; two contractile vacuoles (Kudo, 1966). Ovoid, anterior transversely truncated, posterior rounded; 80-150 μm long; oral groove wide; cytoplasm filled with green zoochlorellae; two contractile vacuoles; a single ovoid macronucleus and a micronucleus; caudal cilia present (Carey, 1992).

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P. bursaria 114 x 47 μm Kenashitai Hakkoda mountain Aomori, 2005	P. bursaria 119 x 60 μm near Dedono-yu Nishiwaga Iwate, 2007	P. bursaria 135 x 72 μm Mizunashi-Yachi Komado marsh Fukushima, 2007	P. bursaria μm Miyatoko m.3 Minami-Aizu Fukushima, 2008
P. bursaria 118 x 53 μm Numa-no-hara m. Madarao highland Niigata, 2005
P. bursaria 103 x 52 μm Yoshigadaira marsh Shirane mountain Gunma, 2005	P. bursaria 118 x 60 μm near Omine-numa Minakami Gunma, 2006	P. bursaria 110 x 65 μm Karasu river Takasaki Gunma, 2004	P. bursaria 120 x 55 μm Shimo-kawahara p. Sayama Saitama, 2005
P. bursaria 143 x 72 μm Omachi natural p. Ichikawa Chiba, 2006	P. bursaria 95-110 x 36-50 μm Japan, 199?	P. bursaria 120-144 x 69 μm Japan, 199?	P. bursaria 123-150 x 53-78 μm Japan, 199?
P. bursaria 108 x 55 μm Shimo-no-koike Shiga highland Nagano, 2004	P. bursaria 135 x 60 μm near Okubo ike Shinano Nagano, 2004	P. bursaria 107 x 54 μm Karakemi marsh Omachi Nagano, 2006	P. bursaria μm Fujimitashiro Katashina Gunma, 2007
P. bursaria 114 x 58 μm Lake Tanuki Fujinomiya Shizuoka, 2006	P. bursaria 148 x 72 μm Sanda Hyogo, 2001

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