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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 Stokes, cell body 84-96 μm long, 40 μm wide, x 400, Japan 199? by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400
Paramecium trichium Paramecium trichium Paramecium trichium
Paramecium trichium Paramecium trichium
P. trichium and other Paramecium (caudatum, aurelia); by Y. Tsukii
P. trichium, double-stained with azure C & fastgreen, by Y. Tsukii
P. trichium, silver-stained, by Y. Tsukii
Paramecium trichium Paramecium trichium Paramecium trichium Paramecium trichium Paramecium trichium

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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