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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 83 μm long, 45 μm wide, a macronucleus ellipsoidal, μm long, μm wide, x 400, x 640, Torinome-kasen-koen, Nasu-shiobara city (formerly Kuroiso city), Tochigo Pref., Japan, January 2001 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Paramecium Paramecium

Paramecium trichium, cell body μm long, μm wide, a macronucleus ellipsoidal, μm long, μm wide, x 400, x 640, Torinome-kasen-koen, Nasu-shiobara city (formerly Kuroiso city), Tochigo Pref., January 2001 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Paramecium Paramecium Paramecium 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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