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Oligohymenophorea (formerly Nassophorea): Peniculida: Parameciidae

Paramecium caudatum
Ehrenberg, 1838

Paroral union

Paramecium caudatum conjugation paroral union 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).

"White" cells = cells cultured with red pea extract; "Black" cells = cells cultured with "Kinako (baked soybean powder)", by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400
Paramecium caudatum, paroral union Paramecium caudatum, paroral union Paramecium caudatum, paroral union

Conjugating pair; living cells observed by phase-contrast microscopy; by A. Yanagi
Paramecium caudatum, paroral union
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