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Polymorphism in the rotifer Asplanchna sieboldi

Fine structure of saccate, cruciform and campanulate females

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Summary

The morphology of saccate, cruciform, and campanulate females of Asplanchna sieboldi was analyzed by light and electron microscopy. No major qualitative variations were observed in the ultrastructure of the hypodermis, gastric gland and yolk gland of females from the different morphotypes. Campanulate females did, however, possess larger secretory granules in their gastric gland as well as larger and more numerous nuclei in their gastric and yolk glands than both saccate and cruciform females.

The structure of the secretory elements in the gastric gland varied between the two clones investigated.

Zusammenfassung

Sackförmige, kreuzförmige und Riesenweibchen von Asplanchna sieboldi wurden mit cytologischen und elektronenmikroskopischen Methoden untersucht. In der Ultrastruktur der Hypodermis, der Magendrüse und des Vitellariums sind die drei Arten ähnlich. Riesenweibchen besitzen im Gegensatz zu den anderen Weibchensorten in der Magendrüse größere Sekretvakuolen. Sie haben in der Magendrüse und im Vitellarium eine größere Anzahl von Zellkernen und eine größere Kernmasse.

Die Feinstruktur der Sekretgranula variiert zwischen den zwei untersuchten Klonen.

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Supported by Public Health Service research grant 1 R01 HD 08210 from the National Institute of Child Health and Human Development, and by Public Health Service research career development award K04-GM-7055 from the National Institute of General Medical Sciences granted to John J. Gilbert

We thank M.E. Kabay for advice on statistics and both him and T.M. Frost for their valuable criticism of the manuscript

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Wurdak, E.S., Gilbert, J.J. Polymorphism in the rotifer Asplanchna sieboldi . Cell Tissue Res. 169, 435–448 (1976). https://doi.org/10.1007/BF00218145

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