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Elektronenmikroskopische Untersuchung an der ForaminifereMyxotheca arenilega Schaudinn

Electronmicroscopic studies on the foraminiferMyxotheca arenilega schaudinn

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Zeitschrift für Zellforschung und Mikroskopische Anatomie Aims and scope Submit manuscript

Summary

  1. 1.

    The gametes ofMyxotheca arenilega are isogametes, which do not differ from one another even in their fine structure.

  2. 2.

    A structure called the “contact region” seems to play an important role during copulation.

  3. 3.

    There is no nucleolus visible in the gametic nucleus, but one can be recognized in the synkaryon.

  4. 4.

    Structures in nucleus and cytoplasm of developing agamonts and gamonts are described.

  5. 5.

    The presence of centrioles was demonstrated in the nuclear divisions during the gametogenesis.

  6. 6.

    The centrioles are located on the outer nuclear membrane. They induce the formation of intranuclear spindel fibers (microtubuli).

  7. 7.

    During the last nuclear division of gametogenesis the centrioles function as basal bodies, out of which the shafts of the flagella grow.

  8. 8.

    Some information concerning the fine structure of the shell and pseudopodia is given.

Zusammenfassung

  1. 1.

    Die Gameten vonMyxotheca arenilega sind Isogameten, die sich auch in ihrer Feinstruktur nicht voneinander unterscheiden.

  2. 2.

    Bei der Kopulation scheint eine als “Kontaktzone” bezeichnete Struktur eine Rolle zu spielen.

  3. 3.

    Während im Kern der Gameten kein Nucleolus erkennbar ist, bildet das Synkaryon einen Nucleolus aus.

  4. 4.

    Die Kern- und Plasmastrukturen der heranwachsenden Agamonten und Gamonten werden beschrieben.

  5. 5.

    Zentriolen konnten bei den der Gametenbildung (Gametogenese) vorausgehenden Kernteilungen nachgewiesen werden.

  6. 6.

    Die Zentriolen liegen der Kernhülle an und induzieren die Bildung intranucleärer Spindelfasern (Mikrotubuli).

  7. 7.

    Bei der letzten Kernteilung fungieren die Zentriolen als Basalkörper und wachsen zu den Schäften der Geißeln aus.

  8. 8.

    Einige Angaben werden auch über den Feinbau der Schale und der Rhizopodien gemacht.

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Authors and Affiliations

  1. Zoologisches Institut der Universität Tübingen, Deutschland

    Dieter Schwab

  2. Fachbereich Physik, Universität Konstanz, Postfach 733, 775 Konstanz

    Dieter Schwab

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  1. Dieter Schwab
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Herrn Prof. Dr.K. G. Grell danke ich für die Anregung zu dieser Arbeit, für die freundliche Überlassung des Objektes und sein Interesse am Fortgang der Untersuchungen.

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Schwab, D. Elektronenmikroskopische Untersuchung an der ForaminifereMyxotheca arenilega Schaudinn. Z. Zellforsch. 96, 295–324 (1969). https://doi.org/10.1007/BF00338774

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