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Ultrastructure of spermatogenesis in the free-living marine nematode Anticoma possjetica (Enoplida: Anticomidae)

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For more content, see Nematologica.

- Spermatogenesis of the free-living marine nematode Anticoma possjetica was studied with electron microscopy. The spermatocyte cytoplasm is filled with numerous ribosomes, mitochondria, cisternae of RER and Golgi bodies. After completion of meiosis the nucleus of the spermatids is surrounded by a newly formed nuclear envelope. The first membranous organelles (MO) appear in the early spermatids, in the late spermatid they, together with mitochondria, surround the nucleus. The ribosomes, RER and Golgi bodies are concentrated inside the residual body. The nuclei of immature spermatozoa assume a bullet-like shape and are surrounded by mitochondria and a mass of MO. The mature spermatozoa possess a small anterior pseudopod anchoring them to the spermatheca wall. The spermatozoon cytoplasm is filled with densely packed MO interspersed with mitochondria. During spermatogenesis of A. possjetica, no organelles resembling the fibrous bodies (FB) found in the spermatozoa of other nematodes were observed. The ultrastructural peculiarities of spermatogenesis in A. possjetica differentiate it from many of the other nematodes studied, although important similarities with other enoplids (reconstitution of nuclear envelope) and other Enoplia (late MO formation) are present.


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