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Free Content Ultrastructure of Cytophores in Spermatid Morulae of Two Microphthalmus Species (Polychaeta: Hesionidae)

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Anuclear central cytoplasmic masses (=cytophores) in spermatid morulae of the two interstitial polychaetes Microphthalmus carolinensis and M. listensis attain their largest dimensions and greatest cytoplasmic variety during the process of nucleus shaping. Abundantly occurring organelles like “clouds” of mitochondria, extended ER cisternae, large vesicles and several structures of unknown nature, imply high biosynthetic activity, thus contradicting the view that the cytophores' most important function is synchronization of gamete development and uptake of superflous spermatid cytoplasm. The cytophores are highly species-specific, regarding structure and arrangement of organelles.

Document Type: Research Article

Publication date: March 1, 1991

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