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Oligohymenophorea (formerly Nassophorea): Peniculida: Parameciidae

 Paramecium trichium
Stokes, 1885

Paramecium trichium 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)

Paramecium trichium ?, cell body 92 μm long, 55 μm wide, L/W=1.7, x 640, drainage ditch, Arai, Kurihashi town, Saitama Pref., Japan, March 4, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Paramecium

P. putrinum Claparède and Lachmann, 1858: Similar to P. bursaria in shape; but single contractile vacuole; no symbiotic chlorella; 80-150 μm long; fresh water (Kudo, 1966).

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