Electron microscopic study of spermiogenesis in the free-living marine nematode Leptosomatides marinae Platonova 1976 (Enoplida: Leptosomatidae)

Electron microscopic study of spermiogenesis in the free-living marine nematode Leptosomatides... The ultrastructure of spermatocytes, spermatids and spermatozoa of the free-living marine nematode Leptosomatides marinae was studied by transmission electron microscopy. In early spermatids, the number of mitochondria, cisterns of the rough endoplasmic reticulum (RER) and dictyosomes increased; the number of membranous organelles (MOs) was insignificant. Later, dictyosomes and MOs filled the cytoplasm. The cytoplasm became distinctly segregated in late spermatids and the MOs concentrated around the nucleus; the mitochondria and organelles of synthesis settled on the cell periphery. Later, a densely packed conglomerate was formed from the central nucleus and a mass of MOs surrounded by an extensive zone of the cytoplasm containing mitochondria and organelles of synthesis. Early spermatozoa had an elongated nucleus surrounded by a layer of cytoplasm containing mitochondria, polarized MOs and bundles of filamentous material, which can be interpreted as fibrous bodies (FBs). The formed spermatozoa had elongated nuclei surrounded by a transparent halo; the cell periphery was a dense matrix, in which MOs and sparse mitochondria were submerged; no FBs were revealed in that phase. In general, the spermatozoa of L. marinae have the main attributes common to the Enoplida spermatozoa, availability of nuclear environment and development of the specific organelles, MOs and FBs, which are not united in complexes. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Marine Biology Springer Journals

Electron microscopic study of spermiogenesis in the free-living marine nematode Leptosomatides marinae Platonova 1976 (Enoplida: Leptosomatidae)

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Publisher
Springer Journals
Copyright
Copyright © 2009 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Freshwater & Marine Ecology
ISSN
1063-0740
eISSN
1608-3377
D.O.I.
10.1134/S1063074009020072
Publisher site
See Article on Publisher Site

Abstract

The ultrastructure of spermatocytes, spermatids and spermatozoa of the free-living marine nematode Leptosomatides marinae was studied by transmission electron microscopy. In early spermatids, the number of mitochondria, cisterns of the rough endoplasmic reticulum (RER) and dictyosomes increased; the number of membranous organelles (MOs) was insignificant. Later, dictyosomes and MOs filled the cytoplasm. The cytoplasm became distinctly segregated in late spermatids and the MOs concentrated around the nucleus; the mitochondria and organelles of synthesis settled on the cell periphery. Later, a densely packed conglomerate was formed from the central nucleus and a mass of MOs surrounded by an extensive zone of the cytoplasm containing mitochondria and organelles of synthesis. Early spermatozoa had an elongated nucleus surrounded by a layer of cytoplasm containing mitochondria, polarized MOs and bundles of filamentous material, which can be interpreted as fibrous bodies (FBs). The formed spermatozoa had elongated nuclei surrounded by a transparent halo; the cell periphery was a dense matrix, in which MOs and sparse mitochondria were submerged; no FBs were revealed in that phase. In general, the spermatozoa of L. marinae have the main attributes common to the Enoplida spermatozoa, availability of nuclear environment and development of the specific organelles, MOs and FBs, which are not united in complexes.

Journal

Russian Journal of Marine BiologySpringer Journals

Published: May 10, 2009

References

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