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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 70 μm long, 34 μm wide, x 640, Shibu-ike (pond), Shiga highland, Yamanouchi town, Nagano Pref., Japan, June 19, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
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P. putrinum Claparède and Lachmann: 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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