Paramecia

Paramecia

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Credit: CLAUDE NURIDSANY & MARIE PERENNOU/SCIENCE PHOTO LIBRARY

Caption: Light micrograph of two ciliate protozoans, Paramecium sp., undergoing conjugation, a type of sexual reproduction. The ciliates possess two different types of nucleus; a small diploid micro- nucleus & a larger polyploid macronucleus. During conjugation the cytoplasm of the two conjugants fuses, the macronuclei disintegrate and the micro- nuclei undergo meiotic division. The haploid products of this division are exchanged & a zygote nucleus is formed in both conjugants. New macro- nuclei are then formed by mitotic division of the genetic material of the new micronuclei. Magnification: x400 at 35mm size.

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Keywords: animal, ciliate, conjugation, invertebrate, invertebrates, light micrograph, nature, paramecium sp., protozoa, protozoan, wildlife, zoology

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