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On the spermiogenesis of Invenusta aestus (Plathelminthes, Proseriata) an ultrastructural study with implications for plathelminth phylogeny

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Summary

The spermiogenesis of Invenusta aestus (Coelogynoporidae) is described based on electron microscopical observations. Special attention is paid to the intercentriolar body and the anchoring apparatus of the cilia. These organelles are differentiated at the beginning of spermatid maturation and undergo striking changes during gametogenesis. The importance of the organelles mentioned for discussion of phylogenetic relationships within the Plathelminthes is considered.

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Abbreviations

ci :

cilium

cy :

cytophore

db :

dense bodies

go :

Golgi complex

icb :

intercentriolar body

mi :

mitochondrion

mt :

microtubules

n :

nucleus

r :

rootlet

spo :

spermatogonia

spt :

spermatids

spy :

spermatocytes

tb :

tubular body

zd :

zone of differentiation

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  1. II. Zoologisches Institut und Museum der Universität Göttingen, Berliner Strasse 28, D-3400, Göttingen, Bundesrepublik Deutschland

    Beate Sopott-Ehlers

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Sopott-Ehlers, B. On the spermiogenesis of Invenusta aestus (Plathelminthes, Proseriata) an ultrastructural study with implications for plathelminth phylogeny. Zoomorphology 109, 145–152 (1989). https://doi.org/10.1007/BF00312266

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  • DOI: https://doi.org/10.1007/BF00312266

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