Spermatogenesis in a Free-Living Marine Nematode Neochromadora poecilosoma (Chromadorida, Chromadoridae) Studied Using TEM

Spermatogenesis in a Free-Living Marine Nematode Neochromadora poecilosoma (Chromadorida,... Spermatogenesis and the structure of mature spermatozoa were studied using TEM in a free-living marine chromadorid nematode Neochromadora poecilosoma from the Sea of Japan. In spermatocytes, fibrous bodies (FB) develop; in spermatids, the synthetic apparatus lies in the residual body, while the nucleus, mitochondria, and FB are located in the main cell body (MCB). The nucleus consists of a diffuse chromatin of fibrous structure, which is not enclosed in a nuclear envelope. In the spermatid stage, the development of FB is completed, and immature spermatozoa from the proximal region of the testis do not show any structural differences from the MCB of spermatids. The mature spermatozoa are polarized cells. They attach to the uterus wall by a pseudopod filled with filaments of the cytoskeleton; in the MCB of spermatozoon, there is a nucleus surrounded by mitochondria and osmiophilic bodies. The spermatozoa of N. poecilosoma show typical ultrastructure features of sperm cells found in most studied nematodes (amoeboid nature and the absence of axoneme, acrosome, and nuclear envelope). However, no aberrant organelles characteristic of nematode spermatozoa were found throughout sperm development in N. poecilosoma and other chromadorids. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Marine Biology Springer Journals

Spermatogenesis in a Free-Living Marine Nematode Neochromadora poecilosoma (Chromadorida, Chromadoridae) Studied Using TEM

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Kluwer Academic Publishers-Plenum Publishers
Copyright © 2002 by MAIK “Nauka/Interperiodica”
Life Sciences; Freshwater & Marine Ecology
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