Genus: Cigar- or foot-shaped; a single macronucleus and 1 to several vesicular or compact microuclei (Kudo, 1966).
Species: Oblong; 50-105 (80-90) μm long; a compact micronucleus; two contractile vacuoles; fresh water (Kudo, 1966). Similar in shape to P. bursaria but much more rounded at both ends; 70-90 μm long; two conctractile vacuoles; a single ovoid macronucleus with a single micronucleus; caudal cilia present (Carey, 1992).
Generally believed P. trichium = P. putrinum (see below)

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P. trichium 98 x 48 μm mac. spherical Saitama, 1999	P. trichium 84-98 x 40 μm Japan, 1998	P. trichium 93 x 55 μm Oura central p. Oura Gunma, 2006	P. trichium 92 x 55 μm drainage ditch Kurihashi Saitama, 2006
P. trichium 91 x 44 μm mac. ellipsoidal Japan, 1998	P. trichium 86-89 x 39-44 μm Kanayama Green p. Kiyose Tokyo, 2003	P. trichium 86-89 x 39-44 μm near Lake Aoki Omachi Nagano, 2006	P. trichium ? 83 x 45 μm mac. ellipsoidal Tochigi, 2001
P. trichium ? 83 x 40 μm large Mic. Bushi, Iruma Saitama, 2002	P. trichium 78 x 39 μm Konosu Saitama, 2003	P. trichium μm near rice field Yachiyo Chiba, 2008
P. trichium 77 x 41 μm Japan, 1999	P. trichium 70 x 34 μm Shibu-ike Shiga highland Nagano, 2005

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