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Histochemical Localization of Succinic Dehydrogenase Activity in the Mitochondria of some Invertebrate Spermatozoa

Nature volume 193, pages 788789 (24 February 1962) | Download Citation

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Abstract

THE mitochondria almost invariably form an essential component of the motile spermatozoa in the invertebrate1. The possible exceptions, such as the spermatozoon of dragon fly2, need re-investigation in the light of fresh reports on Lepisma3,4. The mitochondria form a sheath around the axial filament, covering varying lengths of the flagellate spermatozoon, normally behind the nucleus; the anterior end of the nucleus being occupied by the acrosome. Exceptions to this rule are certain forms reported to have atypical spermatozoa1; the most commonly cited examples being the spermatozoa of Lepisma1,3–5 and Cicindela5,6. In both these cases the centrosome moves forward to the anterior end of the nucleus dragging with it the axial filament having an extension of the mitochondrial sheath. In Lepisma the polarity of the nucleus is completely reversed, consequently the acrosome remains in the neck region and the centrosome heads the spermatozoon. These observations on the atypical flagellate spermatozoa have often been questioned as exemplified by a recent controversy on thysonuran spermatozoa4,7–10.

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Author information

Author notes

    • BRIJ L. GUPTA

    Present address: Department of Zoology, Cambridge.

Affiliations

  1. Department of Zoology, Panjab University, Chandigarh-3.

    • BRIJ L. GUPTA
    •  & VED P. KAMBOJ

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DOI

https://doi.org/10.1038/193788a0

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