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Development of cilia in embryos of the turbellarian Macrostomum

  • Ultrastructure
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Abstract

Electron microscopy of Macrostomum hystricinum raised in culture shows that ciliogenesis in the worm's epidermal blastomeres begins in embryos 39–41 h old with kinetosomal and de novo genesis of presumptive basal bodies, which are morphologically distinguishable from centrioles of the mitotic apparatus, and proceeds by the migration of basal bodies to the apical plasma membrane of the cells and their production there of ciliary axonemes by an age of 51–53 h when the bastomeres emerge between yolk cells on the embryo's surface. Ciliogenesis continues throughout development with the addition of cilia virtually one by one to the expanding epidermal cells' surfaces. At no time in ciliogenesis are stages seen that might show derivation of these multiciliated cells from the primitive monociliated cell type presumably present in the ancestors of the Turbellaria.

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Authors and Affiliations

  1. Electron Microscopy Center and Dept. of Zoology, Washington State Univ., Pullman

    Seth Tyler

  2. Dept. of Anatomy Dalhousie Univ., Halifax, Nova Scotia, Canada

    Seth Tyler

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  1. Seth Tyler
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Tyler, S. Development of cilia in embryos of the turbellarian Macrostomum. Hydrobiologia 84, 231–239 (1981). https://doi.org/10.1007/BF00026184

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