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The micronucleus of Paramecium caudatum is distinctive from
other closely related Paramecium such as P.
multimicronucleatum and P. tetraurela. P. caudatum
has only one micronucleus of a type in which the chromatin is spread
equally throughout the nucleus as opposed to P.
multimicronucleatum which has four very small micronuclei of the
vesicular type and P. aurelia which has two micronuclei of the
vesicular type where the chromatin forms a central electron opaque
mass in the center of the nucleus. The micronucleus in this micrograph
contains many microtubules so it may be in early division. The nuclear
envelope (ne) has many nuclear pores (nep). m,
mitochondrion. EM taken on 3/23/73 by R. Allen with Hitachi HU11A TEM.
Neg. 13,250X. Bar = 0.5µm.
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