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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Ref ID : 4655

Igor B. Raikov; Fine Structure of the Nuclear Apparatus of Remanella multinucleata Kahl (Ciliophora, Gymnostomata). Arch.Protistenk 121:1-19, 1979

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The nuclear apparatus of Remanella multinucleata Kahl (family Loxodidae) is a longitudinal row of unstable nuclear groups, each consisting of two or three macronuclei and one or two micronuclei. Both macro- and micronuclei have a typical nuclear envelope carrying pores and strengthened at the cytoplasmic side by an electron dense sheet and one to three layers of flattened cisternae of the smooth endoplasmic reticulum. The chromosomes remain condensed in interphase micronuclei and may fuse with each other into a common spongy mass. Micronuclei lack both granular component (RNP) and nucleoli, but often contain small, apparently proteinaceous nuclear bodies. Macronuclei contain several nucleoli of typical structure (fibrillar core, granular cortex), with a thread-like nucleolar organizer embedded in each. The macronuclear chromatin is partly dispersed, partly condensed into both numerous small bodies and a few large spherical chromocentres which are often vacuolized. In some specimens, the macronuclei contain also spheres of medium electron density and finely granular structure, containing RNA and protein.