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Oligohymenophorea (formerly Nassophorea): Peniculida: Parameciidae

 Paramecium caudatum
Ehrenberg, 1838

Intact cells

Paramecium caudatum intact cells Genus: Cigar- or foot-shaped; a single macronucleus and 1 to several vesicular or compact micronuclei (Kudo, 1966).
Species: 180-300 μm long; a compact micronucleus; two contractile vacuoles (Kudo, 1966). Cylindrical or cigar-shaped; rounded anteriorly, pointed posteriorly; one large compact micronucleus ("caudatum" group) approximately 8 μm diam.; two contractile vacuoles; 170-290 μm long (Wichterman, 1986). Elongate, rounded anteriorly, pointed posteriorly; caudal cilia present; 180-280 μm long; a single macronucleus with a single micronucleus; two contractile vacuoles (Carey, 1992).
Paramecium caudatum Ehrenberg, cell body 170 μm long, 53 μm wide, L/W=3.2, with macronuclear endosymbionts, x 400, x 640, drainage ditch near Kondo-numa (Kondo pond) park, Tatebayashi city, Gunma Pref., Japan, February 18, 2006 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 caudatum Paramecium caudatum Paramecium caudatum
Cell body 202 μm long, 65 μm wide, L/W=3.1, x 640
Paramecium caudatum Paramecium caudatum Paramecium caudatum Paramecium caudatum Paramecium caudatum Paramecium caudatum Paramecium caudatum Paramecium caudatum Paramecium caudatum
Cell body 185 μm long, 70 μm wide, L/W=2.6, x 400, x 640
Paramecium caudatum Paramecium caudatum Paramecium caudatum Paramecium caudatum Paramecium caudatum
Cell body 132 μm long, 61 μm wide, L/W=2.2, x 400, x 640
Paramecium caudatum Paramecium caudatum Paramecium caudatum Paramecium caudatum Paramecium caudatum Paramecium caudatum
Cell body 185 μm long, 60 μm wide, L/W=3.1, x 640
Paramecium caudatum Paramecium caudatum

Images of collecting locality: Drainage ditch near Kondo-numa (Kondo pond) park, Tatebayashi city, Gunma Pref., Japan, February 18, 2006 by Y. Tsukii

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